单项选择题
（）of this deratting exemption certificate is hereby extended until 4th 0ct.1988 as the vessel is laden with cargo.
A.Validity B.Valid C.Validation D.The coming into force
单项选择题 As matter of fact, the damage to the winches was due to（）.
单项选择题 Because of（）,no separation is needed for the cargoes destined for New York.
单项选择题 BHP stands for the（）of the main engine.
