多项选择题

“Zheng" in Chaozhou was in the past referred to by which of the following names?

A、Qin zheng

B、Zhuazheng

C、Zhazheng

D、Yatoga

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单项选择题

单项选择题

钢的硬度是随着碳含量的增大而减小。
A、正确
B、错误