单项选择题
The main purpose of port State control is not to（）
A.prevent an unsafe ship proceeding to sea
B.prevent a ship threatening the marine environment
C.fine the ships
D.confirm a safe sailing
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单项选择题
Which of the following items don’t belong to dock repair works?（）
A.making the repair list, booking spare parts and special tools for the dock repair
B.shutting off all of the S.W valves to outboard
C.the sketches or diagrams used for the dock repair
D.cleaning up the oil tank and boiler before enter the dock
