单项选择题
A ship is side to be（）when the bow and stern rise and fall with the oncoming waves.
A.rolling B.pitching C.heaving D.swaying
单项选择题 Details about the packing,marking and stowing of（）are given in the International Maritime Dangerous Goods(IMDG)Code.
单项选择题 （）are liable to be stoten, pilfered or may damaged due to improper handing or stowage.
单项选择题 Boilers and cylinders are（）.
