阴道毛滴虫生长繁殖的适宜的PH值是?()
A. 3.8—4.4
B. <3.8
C. <7.0
D. <4.4
E. >7.0
The remaining oil in the lubricating pipes and ducts should be blown out with ().
A. atmosphere
B. the fresh water
C. compressed air
D. chemical compound
《条例》对个人不良信用信息的保存期限设定为5年是怎么考虑的?
转化炉点火前先投用转化气废热锅炉,目的是为了回收转化炉热量。
A. 正确
B. 错误