马氏体不锈钢通常要进行(),降低塑性,使其变得较易加工。
A.正火处理
B.调质处理
C.冷作硬化
D.淬火处理
参考答案:B
I'm very disappointed with my neighbor. She said she would keep her cat off my grass, but she _____. [ ]
A. didn't
B. hasn't
C. wouldn't
D. hadn't
物质的量浓度的国际标准单位是克/毫升。