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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

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