单项选择题
What is the meaning of integration?（）
A.To link some separate factors as a whole chain B.United C.To put together D.Mixture
单项选择题 How many flow are there in global logistics?（）
单项选择题 How long the haul for international deep-sea movement usually?（）
单项选择题 （）Which area is the most commodity shipped in water transport?
