单项选择题
The National Cargo Bureau represents the（）.
A.agent B.operator C.shipper D.All of the above
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.
单项选择题 The best way to determine if a load is within maximum lift limits is to use（）.
