单项选择题
Periodic surveys to renew the load line assignment for a ship must be made at intervals not exceeding（）.
A.18 months B.2 years C.3 years D.5 years
单项选择题 Let’s submit the case（） the cargo surveyor.
单项选择题 In which case is the IOPP Certificate of an inspected vessel NOT invalidated?（）
单项选择题 In the ship construction portfolio，materials which do not conform to ASTM or ABS specifications must also include the（）.
