97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久

<ins id="ypwrn"></ins>

單項(xiàng)選擇題

A probable cause for a turbo generator tripping out on overspeed is a sudden（）

A.loss of field excitation
B.total loss of load
C.large increase in load
D.loss of steam pressure

你可能感興趣的試題

單項(xiàng)選擇題

All of the following operating characteristics are listed on the name-plates of motors used aboard ship except the（）

A.temperature rise
B.input kilowatts
C.horsepower
D.operating voltage

單項(xiàng)選擇題

When would you ground an electric hand tool?（）

A.When it is a DC machine
B.When it is an AC machine
C.Any machine that operates on over 100 volts
D.Only when working on wet steel plates