题目内容
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。
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凸轮基圆半径是指凸轮实际廓线的最小向径。
1.According to the author, the frequent use of social media in making friends gradually reduces the joy of human contact.
2.Responses from the poll in London show that people seldom share intimacies with friends because they are afraid of losing privacy.
3.Cultivating a good friendship goes beyond clicking electronic devices.
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