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單項選擇題

When installed for bilge pumping or ballast duty, centrifugal pumps require a （） to remove air from the suction pipe.

A.air chamber
B.head lank
C.primer
D.prime mover

你可能感興趣的試題

單項選擇題

Water enters the rotating impeller through the entry, known as “（）”, at the centre.

A.eye
B.hole
C.balance holes
D.opening

單項選擇題

Which one is not the normal operation for boiler shutdown?（）

A.Carry out soot blowing if permissible
B.Change fuel supply to diesel oil
C.Close steam stop valves on boiler when pressure is reduced
D.Drain boiler empty when it has cooled down

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When installed for bilge pumping or ballast duty, centrifugal pumps require a （） to remove air from the suction pipe.

你可能感興趣的試題

Water enters the rotating impeller through the entry, known as “（）”, at the centre.

Which one is not the normal operation for boiler shutdown?（）

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