單項(xiàng)選擇題

The external flotation bladder of an immersion suit should be inflated（）.

A.only after two hours in the water
B.only after four hours in the water
C.before entry into the water
D.upon entry into the water

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單項(xiàng)選擇題

The dumping of refuse in a lock is permitted（）.

A.when approved by the lockmaster
B.when locking downbound
C.at no time
D.during high water only

單項(xiàng)選擇題

The disadvantage of using a heaving line to pass a towline is that（）.

A.it increases the likelihood of collision between the towing vessel and the disabled vessel
B.recreational boaters tend to make the heaving line fast to the towed vessel as if it were the towline
C.the monkey fist may injure someone
D.it may reduce the catenary and increase yawing