题目内容

The report gives a _____ picture of the company’s future development .

A. central
B. clean
C. clear
D. comfortable

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The project is still under (discuss),and practical solutions are expected to be found.

A. discussion
B. discuss
C. discussing
D. discussed

last year, traffic accidents have decreased by 10% this year.

A. related to
B. Compared with
Concerned about
Deal with

1.铰链四杆机构存在曲柄的必要条件是最短杆与最长杆长度之和其他两杆之和。

A. 小于等于
B. 大于等于
C. 大于

1.铰链四杆机构存在曲柄的必要条件是最短杆与最长杆长度之和小于或等于其他两杆之和，而充分条件是取为机架。

A. 最短杆或最短杆相邻边
B. 最长杆
C. 最短杆的对边。