社会主义思想道德建设,以________为核心、以______为原则。
A.为人民服务增强诚信意识
B.为人民服务集体主义
C.集体主义为人民服务
D.增强诚信意识为人民服务
答案:B
.Since I came here two years ago, great changes __________ in the factory and many people want to come here to pay a visit.
A have been taken place B. had been taken place C. have taken place D. are taking place
在硅酸盐水泥中掺入适量的石膏,其目的是对水泥起( )作用。
A.促凝
B.缓疑
C.提高产量
D.减少成本