【判断题】【消耗次数:1】
直动平底从动件盘形凸轮机构工作中,其压力角始终不变。
正确
错误
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相关题目
【判断题】 对心移动平底从动件盘形凸轮机构中,其压力角始终保持不变。
①  正确
②  错误
【单选题】 对心直动尖顶盘状凸轮机构的推程压力角超过许用值时,可采用的措施是()。
①  增大基圆半径
②  改用滚子推杆
③  改变凸轮转向
④  减小滚子半径
【单选题】 在凸轮机构中,决定从动件运动规律的是()
①  凸轮转速
②  凸轮轮廓曲线
③  凸轮形状
④  凸轮位置
【判断题】 在凸轮机构中,基圆半径取得较大时,其压力角也较大。
①  正确
②  错误
【单选题】 凸轮机构中从动件常用的运动规律,有刚性冲击的是( ??)。
①  等加速运动规律
②  等减速运动规律
③  简谐运动规律
④  等速运动规律
【判断题】 凸轮机构中,从动件的运动可以是等速、变速、连速、间歇地运动。
①  正确
②  错误
【判断题】 从动件按其运动形式分为直动从动件和摆动从动件,该说法( )
①  正确
②  错误
【单选题】 凸轮机构的类型可按凸轮的形状和运动以及从动件的形式分类,该说法( )
①  正确
②  错误
【单选题】 凸轮机构中的压力角是指凸轮上接触点的[填空]方向间的夹角
①  法线与该点线速度
②  法线与从动件运动
③  切线与从动件运动
【判断题】 滚子从动件凸轮机构的理论轮廓与实际轮廓曲线为等距曲线
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随机题目
【单选题】 This book is ________ that one. But __________ than that one.
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②  as more difficult as ; more expensive
③  as difficult as ; more expensive
④  more difficult as ; as expensive
【单选题】 This box is ________ that one.
①  heavy than
②  so heavy than
③  heavier as
④  as heavy as
【单选题】 -Whats your brother like? -He is _________.
①  adriver
②  very tall
③  myfriend
④  atschool
【单选题】 I will visit you if Father _________ me.
①  let
②  lets
③  is letting
④  will let
【单选题】 Now Mike isn’t here. He ________ Mr. Green’s. Perhaps he ________ back in a few minutes.
①  went to ; is coming
②  has gone to ; will come
③  has been to ; will be
④  is going to ; has come
【单选题】 This bright girl __________ the truth in front of the enemy.
①  didn’t say
②  couldn’t speak to
③  said
④  didn’t tell
【单选题】 Look out ! That tree _______ fall down.
①  is going to
②  will be
③  shall
④  would
【单选题】 Every time I _________ there, I will buy him something nice.
①  went
②  will go
③  go
④  have gone
【单选题】 The bridge which ________ last year looks really beautiful.
①  was built
②  built
③  was set up
④  had been built
【单选题】 Thispencilis ________ anthatone.
①  longest
②  long
③  longer
④  aslong