什么是污泥的比阻？
参考答案：
污泥的比阻是指在一定压力下，在单位过诱介质面积上单位质量的干污泥所受到的阻力，常用R表示，单位为m/kg。
Is this the reason ______he explained at the meeting for his carelessness in his work?
A．that
B．what
C．how
D．why
CRH1A型动车组网侧变流器的中间直流环节电压是（）V。
A.400
B.876
C.900
D.1650
