单项选择题
（）it rain tomorrow morning, the loading（）.
A.Should/will be postponed B.If/shall be postponed C.Should/would be postponed D.If/has to be postponed
单项选择题 （）of the following need not be entered in the official logbook?
单项选择题 （）of the following statements is incorrect regarding a fire and boat drill ao board your cargo vessel.
单项选择题 （）refers to the angle between true North and heading line of the vessel.
