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
单项选择题 We prefer all the spare parts （） on board before departure.
单项选择题 It is well known that the whole power distribution of the ship’s electrical services mainly depend on the（）.
单项选择题 How do you treat someone suffering from electrical shock after you secure the source?（）
