无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

單項(xiàng)選擇題

To avoid damaging the components of a printed circuit board when testing it with a DC volt-ohmmeter, you should ()

A.ground the board
B.avoid reversing the polarity of the leads
C.isolate sensitive components with heat sinks
D.all of the above

微信掃碼免費(fèi)搜題