單項(xiàng)選擇題

If a mooring line should part while you are tying up at a dock，you should make a temporary eye by tying a（）.

A.becket bend
B.clove hitch
C.bowline
D.square knot

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How many adult life jackets are required on board a ship?（）
A.Enough for 100 percent of the persons allowed on board
B.One for each work station and industrial work site
C.Enough for 150 percent of the persons allowed on board
D.Both A and B above
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Heavy fuel oils when spilled are（）.
A.more harmful to sea life than lighter oils
B.easier to clean up than lighter refined oils
C.less harmful to sea life than lighter oils
D.not a real threat to marine life