单项选择题
The necessity of the segregation of cargoes is determined by（）.
A.experience from practice B.various types of cargoes C.different types of ships D.personal abilities
单项选择题 The National Cargo Bureau represents the（）.
单项选择题 The most variable factor in the control of broken stowage is（）.
单项选择题 The chassis of 15 trucks are rust-stained，particularly（）near the mast house.
