單項(xiàng)選擇題

On modern ships, centrifugal pump with a self-primer has replaced reciprocating pump as bilge pump because（）

A.centrifugal pump is cheaper than reciprocating pump
B.the size of centrifugal pump with same capacity is smaller than that of reciprocating pump
C.centrifugal pump makes maintenance easier than reciprocating pump does
D.all of the above

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單項(xiàng)選擇題

When a sudden increase in steam demand occurs from the boiler, the water level in the drum at the higher pressure will（）

A.rise quickly
B.rise slowly
C.drop quickly
D.drop slowly

單項(xiàng)選擇題

Continuous surging of turbocharger can be caused by（）
①crash stop of engine
②increased back pressure after T-Ch
③fouled or damaged turbine nozzle ring

A.all are correct
B.②and③are correct
C.none of the above is correct
D.①only is correct

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On modern ships, centrifugal pump with a self-primer has replaced reciprocating pump as bilge pump because（）

你可能感興趣的試題

When a sudden increase in steam demand occurs from the boiler, the water level in the drum at the higher pressure will（）

Continuous surging of turbocharger can be caused by（） ①crash stop of engine ②increased back pressure after T-Ch ③fouled or damaged turbine nozzle ring

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Continuous surging of turbocharger can be caused by（）
①crash stop of engine
②increased back pressure after T-Ch
③fouled or damaged turbine nozzle ring