载频驻波比告警出现的原因有哪些?()
A.载频连接线
B.载频
C.耦合器
D.天馈系统
参考答案:A, B, C, D
Lian Zhan, the Chairman of the KMT, enjoyed the scenery of the Huangpu River _______ the night
of May 1st. [ ]
A. at
B. in
C. on
D. over
压缩机透平真空高的现象、原因及处理方法?