单项选择题
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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B.before loading the passengers
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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
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