【填空题】【消耗次数:1】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]4. If you dont lace up your shoes, youll[填空1].
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【判断题】 机构运动确定的条件是自由度大于等于1。(  )
①  正确
②  错误
【判断题】 齿轮齿形系数与模数和齿数有关。()
①  正确
②  错误
【判断题】 铰链四杆机构如有曲柄存在,则曲柄必为最短构件。()
①  正确
②  错误
【判断题】 当机构的原动件个数等于机构的自由度的数目时,机构具有确定的运动。()
①  正确
②  错误
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①  正确
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【判断题】 周转轮系的传动比等于各对齿轮传动比的连乘积。()
①  正确
②  错误
【单选题】 带传动不能保证准确的传动比,其原因是______。
①  带容易变形和磨损
②  带在带轮上出现打滑
③  带传动工作时发生弹性滑动
④  带的弹性变形不符合虎克定律
【单选题】 标准直齿圆柱齿轮不根切的最小齿数是____________。  
①  20  
②  17  
③  23  
④  30
【单选题】 凸轮机构中,基圆半径是指凸轮转动中心到______半径。
①  理论轮廓线上的最大
②  实际轮廓线上的最大
③  实际轮廓线上的最小
④  理论轮廓线上的最小
【单选题】 在正常条件下,滚动轴承的主要失效形式为______。
①  滚动体碎裂
②  滚动体与套圈间发生胶合
③  滚道磨损  
④  滚动体与滚道的工作表面疲劳点蚀