问答题

凸轮机构的从动件，按其运动形式可分为

【参考答案】

移动、摆动

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单项选择题

1.5米处日最高温度出现在（）。

A．12-13时
B．13-14时
C．14-15时
D．15-16时

判断题

This is an argument: Biscuits can be bad for your teeth. We often eat mid-morning when the effects of breakfast have worn off. Biscuit companies, like other food manufacturers, require their employees to wear hats to hold back their hair for health and safety reasons.

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