单项选择题
There should be at least two tiers of dunnage for the cargo loaded on tank top，the first tier laid（）.
A.to prevent crushing of cargo B.to separate cargoes C.to prevent small containers from hanging up on the upper edges D.to offer the drainage
单项选择题 When cargo is shifted from the main deck into the lower hold of a vessel，（）.
单项选择题 A wet cargo refers to（）.
单项选择题 （）the general cargo is to be loaded in No.1 tweendeck both wings，where to put the containers?
