尖顶直动推杆从动件盘形凸轮机构,增大凸轮基圆半径,可使( )。
A. 凸轮理论廓线曲率半径增大
B. 凸轮机构的压力角减小
C. 凸轮机构的尺寸增大
D. 凸轮廓线变尖
查看答案
凸轮机构的缺点是凸轮廓线与推杆间为点、线接触,属高副机构,易磨损,多用于传力不大的场合。
A. 对
B. 错
凸轮基圆半径是指凸轮实际廓线的最小向径。
A. 对
B. 错
1.According to the author, the frequent use of social media in making friends gradually reduces the joy of human contact.
A. 对
B. 错
2.Responses from the poll in London show that people seldom share intimacies with friends because they are afraid of losing privacy.
A. 对
B. 错