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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To（）sanitary water from any vessel，an application shall be made to Harbor Authorities for approval.

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

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