單項(xiàng)選擇題

The oil in a cargo winch gear box should be sampled periodically to （）.

A.prevent the gear box from leaking
B.prevent the oil from becoming inflammable
C.make sure it has not become contaminated
D.make sure the motor bearings are lubricated

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單項(xiàng)選擇題

A spur gear pump should be operated with the discharge valves （）.

A.slightly opened
B.throttled
C.fully opened
D.halfway opened

單項(xiàng)選擇題

The capacity of a centrifugal pump can be increased by the installation of a larger diameter impeller Another means of increasing the pump capacity is to （）.

A.increase speed
B.increase the size of the cardent assembly
C.reduce wearing ring clearances
D.change the pump to a "close coupled" arrangement

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The oil in a cargo winch gear box should be sampled periodically to （）.

你可能感興趣的試題

A spur gear pump should be operated with the discharge valves （）.

The capacity of a centrifugal pump can be increased by the installation of a larger diameter impeller Another means of increasing the pump capacity is to （）.

99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精