单项选择题
The series of valves used to control the return flow in well control operations is called the（）.
A.valve assembly
B.standpipe manifold
C.accumulator manifold
D.choke manifold
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A.The bow will go to port
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The purpose of a bilge well is to（）.
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The portable radio apparatus means（）.
A.the radio apparatus fitted on the portside
B.the radio with a portable equipment
C.the radio equipment which is easily movable
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