單項(xiàng)選擇題The valve on the discharge side of a cargo pump on a tanker will usually be a（）.
A.butterfly valve
B.spectacle valve
C.check valve
D.globe valve
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1.單項(xiàng)選擇題The tricing pendants should be released（）.
A.before the gripes are removed
B.before loading the passengers
C.after loading the passengers
D.after the boat is afloat
2.單項(xiàng)選擇題The total quantity of oil discharge into the sea（）for existing tankers 1/15000 of the total quantity of the particular cargo or which the residue formed a part（）.
A.does not exceed
B.should exceed
C.should be up to
D.should be no more than
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