普氏系数f是区分岩石坚固程度的系数。（）
参考答案：对
Would you please keep silent? The weather report _____ and I want to listen. [ ]
A. is broadcast
B. is being broadcast
C. has been broadcast
D. had been broadcast
市场法中的房地产状况调整可以分为区位状况调整、交易情况调整和权益状况调整。( )
