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單項(xiàng)選擇題

The boat is stowed on the davit rather than on a cradle with which type of davit?（）

A.Crescent
B.Sheath-screw boom
C.Quadrantal
D.Radial

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單項(xiàng)選擇題

Static electricity may be built up by the（）.

A.flow of petroleum through pipes
B.spraying or splashing of petroleum
C.settling of solids or water in petroleum
D.All of the above

單項(xiàng)選擇題

Permission is kindly requested（）the ballast water.

A.pump out
B.to pump out
C.pumping out
D.be pumped out

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