单项选择题
The IOPP certificate is valid for （）
A.one year B.two years C.four years D.five years
单项选择题 The shipboard oil pollution emergency plan will be invalid after （）
单项选择题 Prior to a ship’s departure, （） may not always be tested.
单项选择题 Prior to a ship’s departure from any port （） should be tested with deck officer to ensure satisfactory operation.
