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


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2.單項(xiàng)選擇題When a sudden increase in steam demand comes to normal, the drum pressure will and water level in the drum will().

A.rise, rise also
B.rise, drop
C.drop, rise
D.drop, drop also

3.單項(xiàng)選擇題If a hydraulic pump is overheating, the cause may be ().

A.excessive internal leakage in the pump
B.low discharge pressure and fluid flow
C.excessive fluid level in the hydraulic reservoir
D.operation of the pump at 100% efficiency

4.單項(xiàng)選擇題The motor for the fresh water pump ().

A.need to repair
B.need to be repaired
C.needs to repair
D.needs repairing

5.單項(xiàng)選擇題I remember ()the oil separator the day before yesterday But it failed again.

A.to repair
B.to be repaired
C.repairing
D.being repaired