单项选择题
When it is advisable to remain on VHF channel 14 you should say（）.
A.stand by on VHF channel 14 B.come to VHF channel 14 C.VHF channel 14 is the best place for you to stay by D.remain in channel 14 and do not change
单项选择题 （）is the most liable to spontaneous combustion.
单项选择题 （）my knowledge the figure at the loading port is not quite accurate.
单项选择题 （）of this deratting exemption certificate is hereby extended until 4th 0ct.1988 as the vessel is laden with cargo.
