一(yi)、普(pu)通螺(luo)(luo)(luo)(luo)(luo)(luo)紋(wen)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)具(ju)(ju)的(de)(de)裝(zhuang)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)與(yu)(yu)對(dui)(dui)(dui)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)車(che)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)安裝(zhuang)得過(guo)(guo)高(gao)(gao)(gao)或過(guo)(guo)低過(guo)(guo)高(gao)(gao)(gao)，則(ze)吃(chi)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)到一(yi)定深(shen)度(du)時(shi)(shi)(shi)，車(che)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)的(de)(de)后刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)面頂(ding)住工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)，增大(da)摩擦力(li)(li)(li)(li)，甚至把工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)頂(ding)彎(wan)，造成啃(ken)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)現象；過(guo)(guo)低，則(ze)切(qie)屑不(bu)易排出，車(che)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)徑(jing)(jing)(jing)向(xiang)力(li)(li)(li)(li)的(de)(de)方向(xiang)是工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)中心(xin)(xin)，加(jia)上(shang)橫進(jin)(jin)(jin)絲(si)杠(gang)與(yu)(yu)螺(luo)(luo)(luo)(luo)(luo)(luo)母間隙過(guo)(guo)大(da)，致使吃(chi)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)深(shen)度(du)不(bu)斷(duan)自動趨(qu)向(xiang)加(jia)深(shen)，從而(er)(er)把工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)抬起(qi)，出現啃(ken)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)。此時(shi)(shi)(shi)，應(ying)及時(shi)(shi)(shi)調(diao)整(zheng)車(che)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)高(gao)(gao)(gao)度(du)，使其(qi)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)尖(jian)與(yu)(yu)工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)的(de)(de)軸線等(deng)高(gao)(gao)(gao)（可(ke)利用尾(wei)座對(dui)(dui)(dui)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)）。在粗(cu)車(che)和半精車(che)時(shi)(shi)(shi)，刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)尖(jian)位(wei)置(zhi)(zhi)比(bi)工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)的(de)(de)出中心(xin)(xin)高(gao)(gao)(gao)1％D左右（D表(biao)示被加(jia)工(gong)(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)直(zhi)(zhi)徑(jing)(jing)(jing)）。工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)裝(zhuang)夾不(bu)牢(lao)工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)本身的(de)(de)剛(gang)性不(bu)能承受車(che)削(xue)時(shi)(shi)(shi)的(de)(de)切(qie)削(xue)力(li)(li)(li)(li)，因而(er)(er)產(chan)生過(guo)(guo)大(da)的(de)(de)撓度(du)，改變了車(che)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)與(yu)(yu)工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)的(de)(de)中心(xin)(xin)高(gao)(gao)(gao)度(du)（工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)被抬高(gao)(gao)(gao)了），形成切(qie)削(xue)深(shen)度(du)突增，出現啃(ken)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)，此時(shi)(shi)(shi)應(ying)把工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)裝(zhuang)夾牢(lao)固，可(ke)使用尾(wei)座等(deng)，以(yi)增加(jia)工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)剛(gang)性。普(pu)通螺(luo)(luo)(luo)(luo)(luo)(luo)紋(wen)的(de)(de)對(dui)(dui)(dui)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)方法(fa)有試切(qie)法(fa)對(dui)(dui)(dui)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)和對(dui)(dui)(dui)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)儀(yi)自動對(dui)(dui)(dui)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)，可(ke)以(yi)直(zhi)(zhi)接(jie)用刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)具(ju)(ju)試切(qie)對(dui)(dui)(dui)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)，也可(ke)以(yi)用G50設置(zhi)(zhi)工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)零點(dian)，用工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)移設置(zhi)(zhi)工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)零點(dian)進(jin)(jin)(jin)行對(dui)(dui)(dui)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)。螺(luo)(luo)(luo)(luo)(luo)(luo)紋(wen)加(jia)工(gong)(gong)(gong)(gong)(gong)對(dui)(dui)(dui)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)要求(qiu)不(bu)是很高(gao)(gao)(gao)，特別是Z向(xiang)對(dui)(dui)(dui)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)沒有嚴(yan)格的(de)(de)限制(zhi)，可(ke)以(yi)根據編(bian)程加(jia)工(gong)(gong)(gong)(gong)(gong)要求(qiu)而(er)(er)定。二、普(pu)通螺(luo)(luo)(luo)(luo)(luo)(luo)紋(wen)的(de)(de)尺(chi)寸分析1、螺(luo)(luo)(luo)(luo)(luo)(luo)紋(wen)加(jia)工(gong)(gong)(gong)(gong)(gong)前工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)直(zhi)(zhi)徑(jing)(jing)(jing)考慮螺(luo)(luo)(luo)(luo)(luo)(luo)紋(wen)加(jia)工(gong)(gong)(gong)(gong)(gong)牙型的(de)(de)膨(peng)脹量(liang)(liang)(liang)，螺(luo)(luo)(luo)(luo)(luo)(luo)紋(wen)加(jia)工(gong)(gong)(gong)(gong)(gong)前工(gong)(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)直(zhi)(zhi)徑(jing)(jing)(jing)D／D－0.1P，即螺(luo)(luo)(luo)(luo)(luo)(luo)紋(wen)大(da)徑(jing)(jing)(jing)減0.1螺(luo)(luo)(luo)(luo)(luo)(luo)距，一(yi)般根據材料(liao)變形能力(li)(li)(li)(li)小取比(bi)螺(luo)(luo)(luo)(luo)(luo)(luo)紋(wen)大(da)徑(jing)(jing)(jing)小0.1到0.5。2、螺(luo)(luo)(luo)(luo)(luo)(luo)紋(wen)加(jia)工(gong)(gong)(gong)(gong)(gong)進(jin)(jin)(jin)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)量(liang)(liang)(liang)螺(luo)(luo)(luo)(luo)(luo)(luo)紋(wen)加(jia)進(jin)(jin)(jin)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)量(liang)(liang)(liang)可(ke)以(yi)參考螺(luo)(luo)(luo)(luo)(luo)(luo)紋(wen)底徑(jing)(jing)(jing)，即螺(luo)(luo)(luo)(luo)(luo)(luo)紋(wen)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)終進(jin)(jin)(jin)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)位(wei)置(zhi)(zhi)。螺(luo)(luo)(luo)(luo)(luo)(luo)紋(wen)小徑(jing)(jing)(jing)為(wei)：大(da)徑(jing)(jing)(jing)－2倍牙高(gao)(gao)(gao)；牙高(gao)(gao)(gao)＝0.54P（P為(wei)螺(luo)(luo)(luo)(luo)(luo)(luo)距）螺(luo)(luo)(luo)(luo)(luo)(luo)紋(wen)加(jia)工(gong)(gong)(gong)(gong)(gong)的(de)(de)進(jin)(jin)(jin)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)量(liang)(liang)(liang)應(ying)不(bu)斷(duan)減少(shao)，具(ju)(ju)體進(jin)(jin)(jin)刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)量(liang)(liang)(liang)根據刀(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)(dao)具(ju)(ju)及工(gong)(gong)(gong)(gong)(gong)作材料(liao)進(jin)(jin)(jin)行選擇。

通(tong)常平(ping)軌(gui)(gui)數控車(che)床(chuang)在(zai)停車(che)時(shi)(shi)(shi)(shi)(shi)發出巨大(da)響聲，同(tong)時(shi)(shi)(shi)(shi)(shi)車(che)間(jian)(jian)總(zong)電(dian)(dian)(dian)源跳閘(zha)(zha)(zha)。首先檢(jian)查(cha)車(che)間(jian)(jian)電(dian)(dian)(dian)工(gong)對供(gong)(gong)電(dian)(dian)(dian)系統(tong)(tong)進行(xing)檢(jian)查(cha)，跳閘(zha)(zha)(zha)的(de)(de)自(zi)動(dong)(dong)(dong)(dong)空氣斷(duan)(duan)(duan)路器(qi)(qi)所在(zai)處，因(yin)環境潮濕開關(guan)(guan)(guan)盒內自(zi)動(dong)(dong)(dong)(dong)跳閘(zha)(zha)(zha)的(de)(de)連桿機構(gou)已腐蝕，另外三(san)相觸(chu)(chu)點中(zhong)有一(yi)(yi)(yi)相觸(chu)(chu)點只有一(yi)(yi)(yi)小(xiao)部分能(neng)接觸(chu)(chu)。其次(ci)車(che)間(jian)(jian)供(gong)(gong)電(dian)(dian)(dian)變(bian)壓(ya)器(qi)(qi)容(rong)量小(xiao)，超負(fu)荷運(yun)行(xing)。其正(zheng)常的(de)(de)相電(dian)(dian)(dian)壓(ya)只有340V。平(ping)軌(gui)(gui)數控車(che)床(chuang)一(yi)(yi)(yi)只晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)已被燒(shao)壞(huai)，查(cha)看(kan)驅動(dong)(dong)(dong)(dong)電(dian)(dian)(dian)路，觸(chu)(chu)發脈沖短小(xiao)，只有正(zheng)常觸(chu)(chu)發脈沖幅值的(de)(de)四分之一(yi)(yi)(yi)，進一(yi)(yi)(yi)步查(cha)實為觸(chu)(chu)發電(dian)(dian)(dian)路中(zhong)的(de)(de)放大(da)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)性(xing)能(neng)不好所致。故障分析：晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)在(zai)整流狀(zhuang)態(tai)下缺相和在(zai)逆變(bian)狀(zhuang)態(tai)下缺相結果(guo)是不同(tong)的(de)(de)。在(zai)整流狀(zhuang)態(tai)下總(zong)是觸(chu)(chu)發電(dian)(dian)(dian)位(wei)較(jiao)高(gao)的(de)(de)晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)，同(tong)時(shi)(shi)(shi)(shi)(shi)使(shi)(shi)前一(yi)(yi)(yi)相晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)承受反相電(dian)(dian)(dian)壓(ya)而(er)(er)關(guan)(guan)(guan)斷(duan)(duan)(duan)。在(zai)晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)關(guan)(guan)(guan)斷(duan)(duan)(duan)期間(jian)(jian)以反相阻(zu)斷(duan)(duan)(duan)狀(zhuang)態(tai)為主。即使(shi)(shi)后(hou)(hou)(hou)一(yi)(yi)(yi)個晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)不觸(chu)(chu)發，而(er)(er)晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)到一(yi)(yi)(yi)定時(shi)(shi)(shi)(shi)(shi)刻也(ye)會因(yin)過零(ling)而(er)(er)自(zi)動(dong)(dong)(dong)(dong)關(guan)(guan)(guan)斷(duan)(duan)(duan)。但如果(guo)是在(zai)停車(che)降速(su)時(shi)(shi)(shi)(shi)(shi)，即在(zai)逆變(bian)的(de)(de)情況下，同(tong)樣也(ye)是觸(chu)(chu)發電(dian)(dian)(dian)位(wei)較(jiao)高(gao)的(de)(de)晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)導(dao)(dao)通(tong)，并使(shi)(shi)前一(yi)(yi)(yi)個晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)承受反壓(ya)而(er)(er)關(guan)(guan)(guan)斷(duan)(duan)(duan)，這時(shi)(shi)(shi)(shi)(shi)的(de)(de)晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)在(zai)關(guan)(guan)(guan)斷(duan)(duan)(duan)時(shi)(shi)(shi)(shi)(shi)有很長一(yi)(yi)(yi)段時(shi)(shi)(shi)(shi)(shi)間(jian)(jian)處于(yu)正(zheng)向阻(zu)斷(duan)(duan)(duan)狀(zhuang)態(tai)。這樣，若后(hou)(hou)(hou)一(yi)(yi)(yi)個晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)不導(dao)(dao)通(tong)，由于(yu)電(dian)(dian)(dian)感的(de)(de)放電(dian)(dian)(dian)作用，使(shi)(shi)該晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)再延(yan)續(xu)導(dao)(dao)通(tong)一(yi)(yi)(yi)個周期而(er)(er)進入正(zheng)半周，晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)將繼(ji)續(xu)導(dao)(dao)通(tong)下去，同(tong)時(shi)(shi)(shi)(shi)(shi)阻(zu)礙后(hou)(hou)(hou)面的(de)(de)晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)導(dao)(dao)通(tong)。于(yu)是，晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)輸出的(de)(de)正(zheng)向電(dian)(dian)(dian)壓(ya)與電(dian)(dian)(dian)動(dong)(dong)(dong)(dong)機電(dian)(dian)(dian)勢迭(die)加產生(sheng)很大(da)的(de)(de)電(dian)(dian)(dian)流，這時(shi)(shi)(shi)(shi)(shi)即產生(sheng)逆變(bian)顛覆，輕則(ze)燒(shao)壞(huai)保(bao)險絲，重則(ze)燒(shao)壞(huai)晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)。如果(guo)平(ping)軌(gui)(gui)數控車(che)床(chuang)車(che)間(jian)(jian)的(de)(de)電(dian)(dian)(dian)壓(ya)供(gong)(gong)電(dian)(dian)(dian)系統(tong)(tong)正(zheng)常，沒有大(da)的(de)(de)波(bo)動(dong)(dong)(dong)(dong)，也(ye)許不會燒(shao)壞(huai)晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)。交流電(dian)(dian)(dian)網電(dian)(dian)(dian)壓(ya)波(bo)動(dong)(dong)(dong)(dong)大(da)，車(che)間(jian)(jian)變(bian)壓(ya)器(qi)(qi)容(rong)量小(xiao)，超負(fu)荷運(yun)行(xing)，再加之B相正(zheng)組觸(chu)(chu)發脈沖幅值小(xiao)，及車(che)間(jian)(jian)供(gong)(gong)電(dian)(dian)(dian)系統(tong)(tong)的(de)(de)總(zong)開關(guan)(guan)(guan)盒的(de)(de)損(sun)壞(huai)等綜合原因(yin)造成了(le)故障的(de)(de)發生(sheng)。　　處理方法(fa)：　　1.更(geng)換自(zi)動(dong)(dong)(dong)(dong)空氣斷(duan)(duan)(duan)路器(qi)(qi)；　　2.更(geng)換新的(de)(de)晶(jing)(jing)(jing)(jing)(jing)(jing)閘(zha)(zha)(zha)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)。

1.操(cao)作(zuo)(zuo)前穿(chuan)戴好(hao)(hao)防(fang)護用品。2.車(che)(che)(che)(che)床(chuang)(chuang)工必(bi)須(xu)(xu)掌(zhang)握每個(ge)按鈕的(de)作(zuo)(zuo)用以及(ji)操(cao)作(zuo)(zuo)注(zhu)意事(shi)項(xiang)，加工前必(bi)須(xu)(xu)關好(hao)(hao)車(che)(che)(che)(che)床(chuang)(chuang)的(de)防(fang)護門。車(che)(che)(che)(che)床(chuang)(chuang)周圍的(de)工具要(yao)(yao)擺放整齊。3.操(cao)作(zuo)(zuo)車(che)(che)(che)(che)床(chuang)(chuang)時，注(zhu)意車(che)(che)(che)(che)床(chuang)(chuang)各個(ge)部(bu)(bu)位警示牌上的(de)內容。車(che)(che)(che)(che)床(chuang)(chuang)在(zai)通電狀態，操(cao)作(zuo)(zuo)者千萬不(bu)要(yao)(yao)打開和(he)接(jie)觸車(che)(che)(che)(che)床(chuang)(chuang)上示有閃電符號的(de)、裝有強電裝置的(de)部(bu)(bu)位，以防(fang)被。在(zai)打雷時，關閉車(che)(che)(che)(che)床(chuang)(chuang)。不(bu)然容易造成燒壞模塊或丟失改變數(shu)據，造成不(bu)必(bi)要(yao)(yao)的(de)損失。4.刀具裝夾完畢(bi)后(hou)，應(ying)當(dang)先采用手動方(fang)式進(jin)行試切(qie)(qie)。5.車(che)(che)(che)(che)床(chuang)(chuang)運(yun)轉過程中，不(bu)要(yao)(yao)清除切(qie)(qie)屑，禁止用手接(jie)觸車(che)(che)(che)(che)床(chuang)(chuang)運(yun)動部(bu)(bu)件。6.清除切(qie)(qie)屑時，要(yao)(yao)使用工具，避(bi)免(mian)被切(qie)(qie)屑劃破手腳。7.測量工件時，必(bi)須(xu)(xu)在(zai)車(che)(che)(che)(che)床(chuang)(chuang)停止狀態方(fang)可(ke)進(jin)行。8.工作(zuo)(zuo)結(jie)束后(hou)，要(yao)(yao)做好(hao)(hao)車(che)(che)(che)(che)床(chuang)(chuang)及(ji)控制(zhi)設(she)備的(de)清潔工作(zuo)(zuo)，及(ji)時對車(che)(che)(che)(che)床(chuang)(chuang)進(jin)行維護保養。在(zai)維護電氣(qi)裝置時，必(bi)須(xu)(xu)首先切(qie)(qie)斷電源。9.一切(qie)(qie)工作(zuo)(zuo)結(jie)束后(hou)要(yao)(yao)確保切(qie)(qie)斷系(xi)統電源后(hou)方(fang)可(ke)離開。

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