单项选择题
Who is in charge of the auxiliary boilers?（）
A.The chief engineer B.The second engineer C.The third engineer D.The fourth engineer
单项选择题 Who is in charge of the auxiliary engines?（）
单项选择题 Who is in charge of the main engine?（）
单项选择题 Who will be responsible for ensuring that a ship maintains a standard at least equivalent to that specified in international conventions?（）
