单项选择题

4.沥青混凝土的拌和时间分为干拌和湿拌，一般每一个拌和循环周期为（）。
A、25~40s
B、45~60s
C、60~75s
D、80~120s

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单项选择题

设置是社会互动的结构化环境及合理的角色（）和功能实现。‍

A．冲突
B．混淆
C．定位
D．实现

不定项选择

By saying “A man comes to this world with his fist clenched, but when he dies, his hand is open.”, the author means living and death are two natural common process.

A．正确
B．错误