单项选择题

Some sea water came into the wheel house during the voyage due to（）the window thereof.

A.not close
B.not closing
C.we didn't close
D.not to be closed

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单项选择题

If your vessel is dragging her anchor in a strong wind，you should（）.

A.shorten the scope of anchor cable
B.increase the scope of anchor cable
C.put over the sea anchor
D.put over a stern anchor

单项选择题

Production of mechanical foam by a portable in-line foam proportioner（）.

A.increases the size of foam bubbles formed
B.increases the rate of foam production
C.improves the extinguishing properties of foam
D.gives the nozzleman more freedom of movement，since it can be placed anywhere in the hose line