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
单项选择题 If the PSCO has clear grounds for carrying out a more detailed inspection,（）
单项选择题 If （）,the PSCO should proceed to a more detailed inspection.
单项选择题 For a general cargo ship, is not the necessary certificate/document that the PSCO will examine（）
