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
单项选择题 To（）sanitary water from any vessel，an application shall be made to Harbor Authorities for approval.
单项选择题 These weights are（）the ship’s discharging facilities．
单项选择题 The valve on the discharge side of a cargo pump on a tanker will usually be a（）.
