单项选择题
Upon arrival at a port, a vessel is not allowed （） her ballast water, tanker washings or bilge water and other oily water at will.
A.to discharge
B.to be discharged
C.discharging
D.being discharged
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We prefer all the spare parts （） on board before departure.
A.to send
B.to be sent
C.for being sent
D.being to send -
单项选择题
It is well known that the whole power distribution of the ship’s electrical services mainly depend on the（）.
A.sub-boards
B.main switchboards
C.emergency switchboards
D.distribution boards -
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How do you treat someone suffering from electrical shock after you secure the source?（）
A.check for respiration
B.check for pulse
C.treat for shock
D.All of the above
