试题与答案

渐开线直齿圆柱齿轮的啮合角和压力角各指什么角?他们有什么联系?

题型:问答题 简答题

题目:

渐开线直齿圆柱齿轮的啮合角和压力角各指什么角?他们有什么联系?

答案:

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题型:阅读理解

阅读下列图表。从每题所给的A、B、c三个选项中。选出最佳选项回答问题或完成句子。

1. It is _______ in Changsha on Saturday.

A. snowy

B. sunny

C. rainy

2. What's Boris Galkin's telephone number?

A. 514.

B. 555-7833.

C. 23223.

3. All Stores close at _______.

A. 9 A.M.

B. 8 A.M.

C. 8 P.M.

4. What kind of music do Americans like best?

A. Country music

B. Pop music

C. Rock music

5. From the report below, we know_______.

A. the accident happened at 3:20

B. the driver of the taxi didn't stop at the stop sign

C. the accident happened at the corner of Smith and Weston

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