单项选择题
Under MARPOL Code the ship to which it applies has to carry （）
A.an International Ship Security Certificate B.an International Oil Pollution Certificate C.a Safety Management Certificate D.an International Ballast Water Management Certificate
单项选择题 Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）
单项选择题 The shipboard oil pollution emergency plan will be invalid after （）
单项选择题 （）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
