天线的前后比指标与天线中反射板的()有关。
A、长度
B、宽度
C、面积
D、厚度
参考答案:A, B, C
I'm feeling much better now so you()call the doctor.
A. couldn't
B. wouldn't
C. can't
D. needn't
闭合性气胸肺压迫()%可无症状
A.10
B.20
C.30
D.40
E.50