单项选择题
To proceed to the assistance of a ship in distress is（）
A.an obligation for masters of passing by ships B.optional for masters of passing by ships when the weather is fine C.prohibited by the Convention SOLAS, 1974, as amended D.prohibited by the convention STCW 78/95
单项选择题 The main purpose of port State control is not to（）
单项选择题 If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
单项选择题 The treatment of the fuel oils involves storage, heating, filtering and（）
