單項(xiàng)選擇題Before doing maintenance on electrical equipment, you should （）.
A.turn off power first
B.turn on power first
C.with a test pen in hand
D.tell C/E
您可能感興趣的試卷
你可能感興趣的試題
1.單項(xiàng)選擇題While the parallel operation, （） must be used.
A.ammeter
B.voltmeter
C.synchroscope
D.A+B+C
2.單項(xiàng)選擇題When the bearing becomes dry from lack of oil, the motor shaft may heat to （）an extent （） it welds itself to the bearing.
A.either；or
B.neither；nor
C.such；that
D.so；that
最新試題
Under MARPOL Code the ship to which it applies has to carry （）
題型：單項(xiàng)選擇題
The cetane rating of diesel fuel is an indication of the （）
題型：單項(xiàng)選擇題
One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
題型：單項(xiàng)選擇題
Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）
題型：單項(xiàng)選擇題
Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
題型：單項(xiàng)選擇題