[单选题]（）is the general meaning of the contract, bill, note and proof in the process of logistics.

正确答案 ：B

Logistics documents

[单选题]How many tons does the cargo 737 carry?（）

正确答案 ：C

More than 100 tons

[单选题]（）What is PDM?

正确答案 ：B

Physical distribution management

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