单项选择题
An air compressor can be unloaded at start-up by （）.
A.holding the discharge valve open
B.relieving the intercooler pressure to the atmosphere
C.using an enlarged, permanently opened clearance expansion space
D.a pre-charged accumulator
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A.within the space concerned
B.outside the space concerned
C.the throttle station
D.within the fire room -
单项选择题
If an electric motor driven air compressor fails to start, it may be due to a （）.
A.leaking discharge valve
B.jammed suction valve
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Which of the following precautions should always be carried out in dry dock?（）
A.Liquids should never be transferred between tanks without consulting the dock master
B.If sea valves have been disassembled, all bonnets must be checked for leakage when the ship is re-floated
C.Before re-floating, all sea chest strainers should be verified as having been replaced
D.All of the above
