移动通信基站的防雷与接地必须建立在()、均压等电位分区保护的基础上进行整体的、系统的、综合的雷电防护。
A.联合接地
B.单独接地
C.三点接地
D.共同接地
参考答案:A
—Do you want _______ swimming,
—Yes, I do.[ ]
A. go
B. went
C. going
D. to go
My father is a doctor.He works _________.
A.in a hospital
B.in hospital
C.of the hospital
D.at hospital