The usual symptoms of cavitation in a centrifugal pump is （）.

A、noise and vibration

B、an increase in discharge pressure

C、an increase in suction pressure

D、lifting of the relief valve

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第1题

[单选题] 船舶物料商通常给船上供应物料和食品。（）

A、The agent usually provides stores and provisions to the ship. B、The shipyard usually provides stores and provisions to the ship. C、The ship chandler usually provides stores and provisions to the ship. D、The captain usually provides stores and provisions to the ship

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第2题

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A、A. Dry cargo is usually stowed in the hold. B、B. Dry cargo is usually stowed at the hatch. C、C. Wet cargo is usually stowed in the hold.

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第3题

[单选题] 开关舱的工作通常是由船员来做。（）

A、The work of opening and closing hatches is usually done by crew members. B、The work of opening and closing hatch covers is usually done by crew members. C、The work of opening hatch covers is usually done by crew members. D、The work of closing hatch covers is usually done by crew members.