【单选题】【消耗次数：1】
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
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相关题目
【简答题】
凸轮机构基圆半径越[填空1]，压力角越[填空2]，机构传动性能越好。
随机题目
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Classification is a useful ____ to the organization of knowledge in any field.
①
means
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approach
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mode
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manner
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is working
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works
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will be working
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worked
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will; grow
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have; grown
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is ; growing
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is ; grown
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organization
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arrangement
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management
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preparation
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thoughtful
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considerate
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fortunate
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moderate
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_____?
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wouldn’ t you
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hadn’ t you
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would you
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had you
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dont accomplish
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should not accomplish
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would not have accomplished