题目内容
（判断）形成圆柱螺旋线的三个基本要素是圆柱的直径、导程和旋向
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（单选）当圆倾斜于投影面时,其投影为:
(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。
（单选）过曲线上一点的切线,其投影:
[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 _______
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