煤矿水害产生的三大因素是（）
A、水流、水量、水源
B、水量、水源、导水通道
C、导水通道、大气降水、水量
D、大气降水、水流、水量
参考答案：B
_________ and having two beautiful daughters never allow him to look down upon women.
A．Marrying with Michelle
B．Having married to Michelle
C．Being married to Michelle
D．Mr. Smith is married to Michelle
镜下血尿是指每高倍视野中有红细胞在
A．1个以上B．2个以上C．3个以上D．4个以上E．5个以上
