题目内容

词汇与结构Early airplanes had ________ brake system.

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

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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

交易磋商一般包括( )环节。

A. 询盘
B. 发盘
C. 还盘
D. 接受

交易磋商中( )是达成交易、合同成立不可缺少的基本环节和必经的法律步骤。

A. 询盘
B. 发盘
C. 还盘
D. 接受