单项选择题

These weights are（）the ship’s discharging facilities．

A.out
B.beyond
C.from
D.off

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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
单项选择题
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
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