單項(xiàng)選擇題

A stage should only be rigged（）.

A.over the bow or stern of a vessel
B.over the flat sides of a vessel
C.over the open water
D.over the dockside

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A squeeze-grip type carbon dioxide portable fire extinguisher has been partially discharged. It should be（）.

A.replaced in its proper location if weight loss is no more than 15%
B.replaced in its proper location if weight loss is no more than 25%
C.labeled empty and recharged as soon as possible
D.labeled empty and replaced in its proper location regardless of weight

單項(xiàng)選擇題

A special daymark is a（）.

A.red-and-white octagon
B.daymark with a yellow stripe on it
C.green square
D.yellow diamond