判断题
正确(↓↓↓ 点击‘点击查看答案’看答案解析 ↓↓↓)
居里温度是指铁磁性和顺磁性的转变温度或者铁磁性体表现出铁磁性的最高温度。( )A.对 B.错
单项选择题居里温度是指铁磁性和顺磁性的转变温度或者铁磁性体表现出铁磁性的最高温度。( )
下列哪个洛氏硬度可表示测量高硬度材料A.HRB B.HRA C.HRD D.HRC
单项选择题下列哪个洛氏硬度可表示测量高硬度材料
The [填空1]standard is preserved under the most careful c...
问答题The [填空1]standard is preserved under the most careful conditions and improved in a national institute of standards and technology.