题目内容

初等变化贯彻于课程计算工具。

A. 对
B. 错

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平面汇交力系合成方法有。

A. 几何法
B. 解析法
C. 画图法
D. 分解法

几何法求解平面汇交力系平衡，需要将力依次首尾相连。

A. 对
B. 错

It was Friday evening. Mr and Mrs. Green _____ ready to fly to England.

A. are getting
B. get
C. were getting
D. got

Lei Feng ___ always _ of others when he ____ in the army.

A. is, thinking, was
B. was, thinking, is
C. did, think,is
D. was, thinking, was