数据网中的网络设备必须按要求良好接地，接地电阻一般小于（）欧姆
A.0.5
B.1
C.2
D.5
参考答案：A
David is a skillful worker. I’m sure he has enough _______ to fix all the electronic ______.
A．experience; equipment
B．experience; equipments
C．experiences; equipment
D．experiences; equipments
