双极化开线（）。
A、能收发水平极化波
B、不能收发水平极化波
C、能收发垂直极化波
D、不能收发垂直极化波
参考答案：A, C
I have quite a few people .[ ]
A. take care of
B. to take care of
C. to take care
D. take care
装卸作业前怎样设置防护信号？
