单项选择题

A heated bulkhead has the effect on a hygroscopic commodity of（）.

A.causing moisture to accumulate against the bulkhead
B.lowering the vapor pressure of the commodity
C.lowering the dew point of the air
D.raising the vapor pressure of the commodity

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单项选择题

A continuous watertight bulkhead is normally also a(n)（）.

A.structural bulkhead
B.exterior bulkhead
C.centerline bulkhead
D.joiner bulkhead

单项选择题

A band or collar on the top end of a boom to which the topping lift，midships guy，and outboard guys are secured，is called the（）.

A.collar band
B.guy band
C.pad eye collar
D.spider band