题目内容

货物配载时,要综合考虑货物的重量和体积。

A. 对
B. 错

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装车时,先送的客户后装车

A. 对
B. 错

词汇与结构Early airplanes had ________ brake system.

A. hydraulic
B. liquid
C. dynamic
D. hydrodynamic

词汇与结构As the airplane became ________newer systems with hydraulic power were developed.

A. compounded
B. completed
C. sufficient
D. sophisticated

词汇与结构Although some airplane________ make greater uses of hydraulic systems than others, the hydraulic system of the average modern airplane performs many functions.

A. producers
B. manufacturers
C. power- plants
D. factories