题目内容

(判断)当圆柱螺旋线中,圆柱的轴线为铅垂线时,若螺旋线按逆时针方向螺旋上升的,则称为左螺旋线。

A. 对
B. 错

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（单选）过曲线上一点的切线,其投影:

A. 与曲线的同面投影不一定相切
B. 与曲线的投影仍相切,但切点发生了变化
C. 与曲线的投影相切于该点的同面投影上
D. 不与曲线的同面投影相切

[音频]CCA you have a_ in your _Affirm, we have_ engine CCA818 say Maintain and wait to deal with the problemCCA818 heavy contact potomac departure they know what is going on_CCA818Tower united 894United894 towerWe’re parked at C2. You know about the air china taking off to the north with coming out of his engineYes, thank you we do, thank youDeparture, CCA818 we_t of the left engineCCA818 heavy potomac approach-departure, radar contact, _ and say intentionsOkay and ___

[音频]Departure MAYDAY MAYDAY MAYDAY PALL113 we have an _____ on the engine, requesting immediately_PALL113heavy Departure radar contact _____ and which runway did you want?

[填空题]( )是表示过渡配合松紧变化程度的特征值,设计时应根据零件的使用要求来规定这两个极限值。

A. 最大间隙和最大过盈
B. 最大间隙和最小过盈
C. 最大过盈和最小间隙
D. 最小间隙和最小过盈