单项选择题

The “grip” of a joint represents the（）.

A.thickness of the connected members
B.diameter of the head
C.entire length of the rivet
D.diameter of the shank

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单项选择题

Starting motors，generators，and other spark producing devices should be mounted as high above the bilges as possible to（）.

A.keep them dry when the bilges are full of water
B.keep them cool when the vessel is underway
C.make them more accessible for repairs
D.prevent accidental ignition of any gasoline vapors that may have accumulated in the bilges

单项选择题

Small hull leaks can be temporarily repaired by（）.

A.parcelling
B.parbuckling
C.caulking
D.seizing

单项选择题

Rivets are usually made of（）.

A.wrought-iron
B.aluminum
C.high-tensile steel
D.mild steel