单项选择题

该符号的含义是被标注表面是用去除材料的方法获得的表面，Ra的下限值是3.2。

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单项选择题

c旋律小调上行音阶的导音是: A. B. C. D.

问答题

Choose from the given transitions to fill in the blank. whereas, as a illustration, consequently Some drivers have no respect for the speed limit and [填空1] are punished.

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