问题
多项选择题
当使用YBT250进行清频测试需要下列哪些必备仪器：（）
A.50欧姆匹配负载
B.八木天线
C.低噪放
D.带通滤波器。
答案
参考答案：A, B, C, D
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当使用YBT250进行清频测试需要下列哪些必备仪器：（）
A.50欧姆匹配负载
B.八木天线
C.低噪放
D.带通滤波器。
参考答案：A, B, C, D
| 用方框中所给词语的适当形式填空,完成短文。(有两个多余的单词) | |
front of you is the middle school. I __2__ there. The post office is on its left and the hospital is on its right. The library is __3__ our school. You can do a lot of reading there. There is also a big __4__ behind the hospital. I often play with my friends there on weekends. The cinema is the most popular place in my hometown. We all like __5__ films there. If you have time, please come to my hometown for a visit. | |