单项选择题
Functions aboard a tanker or tank barge such as connecting, disconnecting, and topping off must be supervised by（）.
A.any certificated tankerman B.the master of the vessel C.the officer of the watch D.the person designated as person in charge
单项选择题 Gasoline tanks should be filled（）.
单项选择题 Generally speaking , the heavier cargo will go into the（）,distributing it evenly fore and aft, the lighter cargo will probably be placed in the（）.
单项选择题 Holes in the bulwark,Which allow deck water to drain into the sea, are（）.
