单项选择题
（）(液体)cargo is carried by tankers.
A.Dangerous B.Liquid C.Inflammable D.Heavy
单项选择题 （）(干散) cargo is carried by bulk carriers.
单项选择题 A lightship is like an/a（）(普通船舶).
单项选择题 A container ship is one of the （）(干货) ships .
