单项选择题

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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Static electricity may be built up by the（）.

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

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Permission is kindly requested（）the ballast water.

A.pump out
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B.prevent the passage of poisonous vapors
C.delay the spread of heat and flames
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