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單項(xiàng)選擇題

If a bilge pump failed to build up discharge pressure, you should check for （）.

A.excessive water in the bilges
B.a clogged suction strainer
C.oil in the bilges
D.All of the above

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單項(xiàng)選擇題

The shaft and spare parts（） should be well greased in order to avoid corrosion.

A.in the store room
B.in the cylinder
C.in the scavenge air box
D.in the water box

單項(xiàng)選擇題

Water level controllers of the boiler must be kept operable to protect external steam-using plant from water “（）” danger.

A.carry off
B.carry down
C.carry on
D.carry over

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