单项选择题
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
A continuous watertight bulkhead is normally also a(n)（...
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
A band or collar on the top end of a boom to which the ...
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
（）is the main center-line structural member，running for...
单项选择题（）is the main center-line structural member，running fore and aft along the bottom of a ship，sometimes referred to as the backbone.
A.Frame B.Deckbeam C.Stringer D.Keel
