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

<progress id="t4p32"></progress>

<ins id="t4p32"></ins>

單項選擇題

If a voltmeter is connected across a line, it must be protected with a（）

A.shunt
B.high-resistance coil in the armature circuit
C.low-resistance coil in the armature circuit
D.shunt and a coil of high resistance

你可能感興趣的試題

單項選擇題

When current and voltage reach maximum values at the same time, the power factor is（）

A.minimum
B.maximum
C.leading
D.lagging

單項選擇題

Which is an acceptable means of correcting high mica between commutator bars?（）

A.undercutting
B.sanding
C.burnishing
D.filing

<ins id="yt9ce"></ins>