单项选择题
A.The first line at the bottom
B.The second line from the bottom
C.The third line from the bottom
D.The fourth line from the bottom
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?（）.
单项选择题 Which of the following is more suitable for bagged cargo?（）.