对学生全面严格要求包括（）。
A.严格考勤制度
B.严把考试关
C.严要有度
D.严要有方
参考答案：C, D
Progress _____ so far very good and we are sure that the work will be finished on time.
A．was
B．had been
C．has been
D．will be
对电除尘器来说，反电晕能产生什么危害作用？
