单项选择题
When discharging an oil cargo，the first consideration is to（）.
A.get the bow up B.discharge from the wings first C.discharge from the centerline tanks first D.discharge from amidships first
单项选择题 What is/are the advantage（s）of cranes over conventional cargo booms（）.
单项选择题 What is the purpose of the equalizing beam aboard a crane vessel（）.
单项选择题 What is meant by the term“luffing the boom”of a crane（）．
