单项选择题 The following figure is the schematic of effectof heating temperature on microstructure and properties of cold-deformedmetals, which curve shows the change of grain size? A. A曲线 B. B曲线 C. C曲线 D. D曲线

单项选择题 外圆轴的尺寸公差为( ) A. -0.023 B. +0.02 C. 0.05 D. Ø52.02

判断题 网络嗅探器可以捕获流经网卡的数据包，并能分析该数据包。正确错误