单项选择题
To prevent the riser system from buckling under its own weight，upward tension is provided by the（）.
A.riser stabilizers
B.guideline tensioning system
C.riser tensioning system
D.guideline stabilizers
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A.discharge
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These weights are（）the ship’s discharging facilities．
A.out
B.beyond
C.from
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The valve on the discharge side of a cargo pump on a tanker will usually be a（）.
A.butterfly valve
B.spectacle valve
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D.globe valve
