在(zai)車銑(xian)復合數控機(ji)床加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)過程中(zhong)，加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)對象復雜，特別(bie)是(shi)(shi)一(yi)(yi)(yi)些輪(lun)廓曲線形狀以(yi)(yi)(yi)及(ji)位(wei)置有(you)變化的(de)(de)(de)，再加(jia)(jia)上材(cai)料、批量(liang)的(de)(de)(de)不同增(zeng)加(jia)(jia)了加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)難度(du)。所以(yi)(yi)(yi)在(zai)對具體零件(jian)制定(ding)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)順(shun)(shun)序(xu)(xu)(xu)(xu)時(shi)，應(ying)(ying)該行(xing)(xing)具體分析和區別(bie)對待(dai)，靈活處理(li)。這樣才能(neng)保(bao)證加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)順(shun)(shun)序(xu)(xu)(xu)(xu)的(de)(de)(de)和理(li)性。從而提高(gao)生產效率，收獲到高(gao)質量(liang)的(de)(de)(de)產品(pin)。在(zai)編程時(shi)要(yao)充(chong)分考慮兩個層(ceng)面(mian)(mian)的(de)(de)(de)問題，一(yi)(yi)(yi)是(shi)(shi)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)順(shun)(shun)序(xu)(xu)(xu)(xu)，二是(shi)(shi)參數，如轉速，進(jin)(jin)給量(liang)，切(qie)削(xue)深度(du)。　　加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)順(shun)(shun)序(xu)(xu)(xu)(xu)一(yi)(yi)(yi)般為：先鉆孔，后(hou)(hou)平(ping)端(duan)。這樣可以(yi)(yi)(yi)防止(zhi)鉆孔時(shi)縮料；先粗加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)，后(hou)(hou)細(xi)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)；先加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)公差大(da)的(de)(de)(de)然后(hou)(hou)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)公差小(xiao)的(de)(de)(de)。　　順(shun)(shun)序(xu)(xu)(xu)(xu)一(yi)(yi)(yi)般應(ying)(ying)按下(xia)列(lie)原則進(jin)(jin)行(xing)(xing)：　　1、上道工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)序(xu)(xu)(xu)(xu)的(de)(de)(de)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)不能(neng)影(ying)響(xiang)下(xia)道工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)序(xu)(xu)(xu)(xu)的(de)(de)(de)定(ding)位(wei)與(yu)夾緊(jin)(jin)，中(zhong)間穿插有(you)通用(yong)車床加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)序(xu)(xu)(xu)(xu)的(de)(de)(de)也要(yao)綜合考慮。　　2、行(xing)(xing)內(nei)形內(nei)腔加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)序(xu)(xu)(xu)(xu)，后(hou)(hou)進(jin)(jin)行(xing)(xing)外形加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)序(xu)(xu)(xu)(xu)。　　3、在(zai)同一(yi)(yi)(yi)次安(an)(an)裝中(zhong)進(jin)(jin)行(xing)(xing)的(de)(de)(de)多道工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)序(xu)(xu)(xu)(xu)，應(ying)(ying)先安(an)(an)排(pai)對工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)件(jian)剛(gang)性破壞小(xiao)的(de)(de)(de)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)序(xu)(xu)(xu)(xu)。　　4、以(yi)(yi)(yi)相(xiang)同定(ding)位(wei)、夾緊(jin)(jin)方式或(huo)同一(yi)(yi)(yi)把(ba)刀加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)的(de)(de)(de)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)序(xu)(xu)(xu)(xu)應(ying)(ying)先連(lian)接進(jin)(jin)行(xing)(xing)，以(yi)(yi)(yi)減少(shao)重復定(ding)位(wei)次數，換刀次數與(yu)挪動壓(ya)板次數。　　5、內(nei)叉對既有(you)內(nei)表(biao)面(mian)(mian)（內(nei)型腔），又有(you)外表(biao)面(mian)(mian)需(xu)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)的(de)(de)(de)零件(jian)，安(an)(an)排(pai)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)順(shun)(shun)序(xu)(xu)(xu)(xu)時(shi)，應(ying)(ying)行(xing)(xing)內(nei)外表(biao)面(mian)(mian)粗加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)，后(hou)(hou)進(jin)(jin)行(xing)(xing)內(nei)外表(biao)面(mian)(mian)精加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)

在(zai)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)中(zhong)(zhong)心(xin)中(zhong)(zhong)，車銑(xian)(xian)復(fu)合(he)(he)數(shu)(shu)控(kong)(kong)機床(chuang)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)一(yi)般(ban)需(xu)(xu)要(yao)(yao)運用(yong)多把刀具，所(suo)以(yi)(yi)我(wo)們要(yao)(yao)合(he)(he)理安(an)排加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)次序(xu)，這(zhe)樣(yang)有(you)利于提高加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)精(jing)(jing)度(du)、加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)功率及經(jing)濟效益。在(zai)安(an)排車銑(xian)(xian)復(fu)合(he)(he)數(shu)(shu)控(kong)(kong)機床(chuang)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)時(shi)要(yao)(yao)遵(zun)照'基(ji)(ji)面(mian)'、'先(xian)(xian)面(mian)后孔(kong)'、'先(xian)(xian)主后次'及'先(xian)(xian)粗(cu)后精(jing)(jing)'的(de)(de)一(yi)般(ban)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)藝原則。定(ding)位(wei)(wei)基(ji)(ji)準(zhun)(zhun)(zhun)(zhun)的(de)(de)選擇直(zhi)接(jie)影(ying)響到加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)順(shun)序(xu)的(de)(de)安(an)排，作為(wei)(wei)定(ding)位(wei)(wei)基(ji)(ji)準(zhun)(zhun)(zhun)(zhun)面(mian)應先(xian)(xian)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)好，以(yi)(yi)便(bian)為(wei)(wei)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)其他面(mian)供給(gei)一(yi)個可(ke)靠的(de)(de)定(ding)位(wei)(wei)基(ji)(ji)準(zhun)(zhun)(zhun)(zhun)。因為(wei)(wei)本(ben)道(dao)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)序(xu)選出(chu)定(ding)位(wei)(wei)基(ji)(ji)準(zhun)(zhun)(zhun)(zhun)后加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)出(chu)的(de)(de)表面(mian)，有(you)可(ke)能是下道(dao)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)序(xu)的(de)(de)定(ding)位(wei)(wei)基(ji)(ji)準(zhun)(zhun)(zhun)(zhun)，所(suo)以(yi)(yi)待各加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)序(xu)的(de)(de)定(ding)位(wei)(wei)基(ji)(ji)準(zhun)(zhun)(zhun)(zhun)判(pan)(pan)定(ding)之后，即可(ke)從畢(bi)竟精(jing)(jing)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)序(xu)向前逐級倒推(tui)出(chu)整(zheng)個工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)序(xu)的(de)(de)大致順(shun)序(xu)。判(pan)(pan)定(ding)車銑(xian)(xian)復(fu)合(he)(he)數(shu)(shu)控(kong)(kong)機床(chuang)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)順(shun)序(xu)時(shi)，還要(yao)(yao)先(xian)(xian)了解(jie)零件(jian)是否要(yao)(yao)進行加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)前的(de)(de)預(yu)(yu)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)。預(yu)(yu)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)常(chang)由一(yi)般(ban)車床(chuang)結(jie)束(shu)。若毛坯精(jing)(jing)度(du)較高，定(ding)位(wei)(wei)也較可(ke)靠，或加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)余量充(chong)分且均勻，則可(ke)不必進行預(yu)(yu)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)，而直(zhi)接(jie)在(zai)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)中(zhong)(zhong)心(xin)上加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)。這(zhe)時(shi)，要(yao)(yao)根據毛坯粗(cu)基(ji)(ji)準(zhun)(zhun)(zhun)(zhun)的(de)(de)精(jing)(jing)度(du)考慮加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)中(zhong)(zhong)心(xin)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)序(xu)的(de)(de)區(qu)別，可(ke)所(suo)以(yi)(yi)一(yi)道(dao)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)序(xu)或分紅幾道(dao)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)序(xu)來結(jie)束(shu)。車銑(xian)(xian)復(fu)合(he)(he)數(shu)(shu)控(kong)(kong)機床(chuang)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)零件(jian)時(shi)，比較難(nan)保證的(de)(de)是加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)面(mian)與非加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)面(mian)之間的(de)(de)標準(zhun)(zhun)(zhun)(zhun)，這(zhe)一(yi)點和數(shu)(shu)控(kong)(kong)銑(xian)(xian)削相(xiang)同。因此(ci)，即使圖樣(yang)要(yao)(yao)求的(de)(de)對錯(cuo)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)面(mian)，也需(xu)(xu)要(yao)(yao)在(zai)制造毛坯時(shi)在(zai)非加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)面(mian)上添加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)恰(qia)當余量，以(yi)(yi)便(bian)在(zai)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)中(zhong)(zhong)心(xin)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)時(shi)，保證非加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)面(mian)與加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)面(mian)間的(de)(de)標準(zhun)(zhun)(zhun)(zhun)符合(he)(he)圖樣(yang)要(yao)(yao)求。相(xiang)同，若車銑(xian)(xian)復(fu)合(he)(he)數(shu)(shu)控(kong)(kong)機床(chuang)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)前的(de)(de)預(yu)(yu)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)面(mian)與加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)中(zhong)(zhong)心(xin)所(suo)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)的(de)(de)面(mian)之間有(you)標準(zhun)(zhun)(zhun)(zhun)的(de)(de)要(yao)(yao)求，也應在(zai)預(yu)(yu)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)時(shi)留必定(ding)的(de)(de)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)余量，盡(jin)量在(zai)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)中(zhong)(zhong)心(xin)的(de)(de)一(yi)次裝(zhuang)夾中(zhong)(zhong)結(jie)束(shu)包括預(yu)(yu)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)面(mian)在(zai)內的(de)(de)一(yi)切(qie)加(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)內容(rong)。

是(shi)一(yi)(yi)種帶程(cheng)序控(kong)(kong)制(zhi)系統的(de)(de)(de)(de)(de)(de)(de)自動(dong)車床(chuang)。控(kong)(kong)制(zhi)系統能(neng)夠(gou)邏輯地處理(li)具有控(kong)(kong)制(zhi)代碼或(huo)符號指令的(de)(de)(de)(de)(de)(de)(de)其他規范的(de)(de)(de)(de)(de)(de)(de)程(cheng)序，對其進(jin)(jin)行并使用編(bian)碼數字(zi)表示通(tong)過信息載(zai)體進(jin)(jin)入(ru)數控(kong)(kong)裝置。通(tong)過運算(suan)處理(li)，數控(kong)(kong)裝置發出(chu)若(ruo)干控(kong)(kong)制(zhi)信號以(yi)控(kong)(kong)制(zhi)車床(chuang)的(de)(de)(de)(de)(de)(de)(de)運動(dong)，并根(gen)據(ju)(ju)圖紙(zhi)所需的(de)(de)(de)(de)(de)(de)(de)形狀和(he)尺寸自動(dong)處理(li)零件。車銑復(fu)合(he)數控(kong)(kong)機床(chuang)解(jie)決(jue)了小批(pi)量、的(de)(de)(de)(de)(de)(de)(de)、精(jing)(jing)度的(de)(de)(de)(de)(de)(de)(de)、復(fu)雜部(bu)分的(de)(de)(de)(de)(de)(de)(de)問題。它是(shi)一(yi)(yi)種靈活的(de)(de)(de)(de)(de)(de)(de)自動(dong)車床(chuang)，代表了現代車床(chuang)控(kong)(kong)制(zhi)技(ji)術的(de)(de)(de)(de)(de)(de)(de)發展方(fang)向，這就是(shi)典型(xing)的(de)(de)(de)(de)(de)(de)(de)機電一(yi)(yi)體化產品。　　一(yi)(yi)般(ban)車銑復(fu)合(he)數控(kong)(kong)機床(chuang)只有直(zhi)線和(he)圓弧插補功能(neng)。對于由直(zhi)線和(he)圓弧組成的(de)(de)(de)(de)(de)(de)(de)平面輪廓(kuo)，編(bian)程(cheng)時數值計(ji)算(suan)的(de)(de)(de)(de)(de)(de)(de)主要(yao)任(ren)務是(shi)求各基(ji)(ji)(ji)點(dian)(dian)(dian)(dian)的(de)(de)(de)(de)(de)(de)(de)坐(zuo)標(biao)。　　1.基(ji)(ji)(ji)點(dian)(dian)(dian)(dian)的(de)(de)(de)(de)(de)(de)(de)含義　　構(gou)成零件輪廓(kuo)的(de)(de)(de)(de)(de)(de)(de)不同(tong)幾何(he)素(su)線的(de)(de)(de)(de)(de)(de)(de)交點(dian)(dian)(dian)(dian)或(huo)切(qie)點(dian)(dian)(dian)(dian)稱為(wei)基(ji)(ji)(ji)點(dian)(dian)(dian)(dian)。基(ji)(ji)(ji)點(dian)(dian)(dian)(dian)可以(yi)直(zhi)接(jie)作為(wei)其運動(dong)軌(gui)跡的(de)(de)(de)(de)(de)(de)(de)起點(dian)(dian)(dian)(dian)或(huo)終點(dian)(dian)(dian)(dian)。　　2.直(zhi)接(jie)計(ji)算(suan)的(de)(de)(de)(de)(de)(de)(de)內容　　根(gen)據(ju)(ju)填寫加工程(cheng)序單的(de)(de)(de)(de)(de)(de)(de)要(yao)求，基(ji)(ji)(ji)點(dian)(dian)(dian)(dian)直(zhi)接(jie)計(ji)算(suan)的(de)(de)(de)(de)(de)(de)(de)內容有：每條(tiao)運動(dong)軌(gui)跡的(de)(de)(de)(de)(de)(de)(de)起點(dian)(dian)(dian)(dian)和(he)終點(dian)(dian)(dian)(dian)在(zai)選定(ding)坐(zuo)標(biao)系中的(de)(de)(de)(de)(de)(de)(de)坐(zuo)標(biao)，圓弧運動(dong)軌(gui)跡的(de)(de)(de)(de)(de)(de)(de)圓心坐(zuo)標(biao)值。　　基(ji)(ji)(ji)點(dian)(dian)(dian)(dian)直(zhi)接(jie)計(ji)算(suan)的(de)(de)(de)(de)(de)(de)(de)方(fang)法比較簡單，一(yi)(yi)般(ban)可根(gen)據(ju)(ju)零件圖樣(yang)所給的(de)(de)(de)(de)(de)(de)(de)已知條(tiao)件用人工完(wan)成。即依據(ju)(ju)零件圖樣(yang)上(shang)給定(ding)的(de)(de)(de)(de)(de)(de)(de)尺寸運用代數、三角、幾何(he)或(huo)解(jie)析幾何(he)的(de)(de)(de)(de)(de)(de)(de)有關知識(shi)，直(zhi)接(jie)計(ji)算(suan)出(chu)數值。在(zai)計(ji)算(suan)時，要(yao)注意小數點(dian)(dian)(dian)(dian)后的(de)(de)(de)(de)(de)(de)(de)位數要(yao)留(liu)夠(gou)，以(yi)保證足夠(gou)的(de)(de)(de)(de)(de)(de)(de)精(jing)(jing)度。

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