单项选择题
The International Air Pollution Prevention Certificate (IAPP) is issued to（）
A.ships of above 200 GT to MARPOL B.every ship of 400 GT and above C.all ships D.ships of more than 200 GT but less 400 GT
单项选择题 The International Sewage Pollution Prevention Certificate (ISPP) is issued to （）
单项选择题 The IOPP certificate is valid for （）
单项选择题 The shipboard oil pollution emergency plan will be invalid after （）
