单项选择题
A.the code flags FR B.a black ball over a black diamond shape C.code flag Quebec over a black ball D.two black diamond shapes in a vertical line
Some sea water came into the wheel house during the voy...
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
If your vessel is dragging her anchor in a strong wind，...
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
Production of mechanical foam by a portable in-line foa...
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
