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
单项选择题 If your vessel is dragging her anchor in a strong wind，you should（）.
单项选择题 Production of mechanical foam by a portable in-line foam proportioner（）.
单项选择题 Marline is（）.
