单项选择题
Which of the followings is not an indication of a bad maintenance?（）
A.a pipe with welded connections B.a pipe with several clips C.a cement box D.a leaking valve
单项选择题 In deciding to detain a ship or not, the PSCO would better not（）
单项选择题 The main purpose of port State control is not to（）
单项选择题 If the PSCO has clear grounds for carrying out a more detailed inspection,（）
