单项选择题

Which of the following is not a type of stereotype?

A.
B.
C.

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单项选择题

Listening to the audio and answer the following three questions: 1.The store has the following listed promotion that comes with the dustcoat.

A.buy
B.buy
C.year-end

莫氏圆锥有7个号码（）

A.正确
B．错误

答案： B．错误莫氏圆锥是一种用于钻孔、铰孔、攻丝等加工的锥形工具，其锥度是标准化的。莫氏圆锥系列共有12个号码，从0号到11号...