单项选择题
A.they are not subjected to cause trouble
B.they are difficult to handle this kind of cargo
C.the efficiency of separating is raised
D.the efficiency of loading is greater
单项选择题 Which is the summer load waterline on the load waterline mark?（）.
单项选择题 Which of the following is more important in determining the amount of free surface that will be produced?（）.
单项选择题 Which of the following is more important in determining the amount of free surface that will be produced?（）.