一般标准麻花钻的顶角在()左右。 A.108° B.118° C.140° D.90

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问题:

一般标准麻花钻的顶角在()左右。

A.108°

B.118°

C.140°

D.90°

考点:数控车工考试高级数控车工高级数控车工题库
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近似数2.190精确到______位,它有______个有效数字.

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     punish,   approach,   represent,   nod,   express,   yawn,   introduce,   avoid,   misunderstand,   touch
1. Stop ______ and go to bed if you're tired.
2. He ______ by his father for telling lies yesterday.
3. We can't ______ to you how grateful we are.
4. Mr Smith ______ when he passed me in the street.
5. A strong typhoon is ______ Fujian.
6. She ______ her fellow-workers at the union meeting last time.
7. May I ______ myself? My name is Meg Johnson.
8. Children quickly learn how to ______ punishment.
9. He complains that his wife always ______ him.
10. Don't ______ the door; the paint is wet.
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.探究小车速度随时间变化规律的实验中,得到一条记录小车运动情况的纸带,交流电频率50Hz,每五个点取一个计数点如图得到A B C D E五个点,则C点速度为____m/s,D点速度为____m/s, ,AD段平均速度是____m/s,若小车做匀加速运动则加速度大小是___m/s2方向______________(填A    B或B    A)

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继电器的()与()的比值,叫做继电器的返回系数。

A.动作电压

B.动作电流

C.返回电压

D.返回电流

题型:单项选择题

板牙是一种常用的加工精度较高的外螺纹刀具。

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