单项选择题
（）has 3 specific points: fixed port, fixed line and announcing shipping time in advance.
A.liner transport B.line ship C.line container D.line
单项选择题 （）is very convenient equipment for loading and unloading goods.
单项选择题 he area for unloading goods in warehouse is（）
单项选择题 （）performs 2 basic functions: marketing and logistics.
