A.先按電源按鈕,再按檢流計(jì)按鈕B.先按檢流計(jì)按鈕,再按電源按鈕C.同時(shí)按電源按鈕和檢流計(jì)按鈕D.斷開(kāi)時(shí)先放電源按鈕,再放檢流計(jì)按鈕
A.表頭斷線B.表筆斷線C.表內(nèi)整流裝置損壞D.調(diào)零電位器短路
A.0.10mmB.0.15mmC.0.20mmD.0.25mm