单项选择题
A vessel’s bottom will be subjected to tension when weight is concentrated（）.
A.amidships B.aft C.at both ends of the vesel D.forward
单项选择题 A vessel’s quarter is that section which is（）.
单项选择题 A V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.
单项选择题 A wet cargo refers to（）.
