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