渗透探伤时,对表面粗糙的工件宜选用()型渗透剂,对表面光洁的工件宜选用()型渗透剂
参考答案:水洗;后乳化或溶剂去除
日本7-11便利店的征募顾问必须经过哪些阶段的培训才能正式上岗?
In a certain group of people,
of the people are men, and
of the men have brown eyes. If
of the people have brown eyes, then what fraction of the group are women who do not have brown eyes