问题
多项选择题
对地球站发射系统的主要要求是:()。
A.发射功率大
B.频带宽度500MHz以上
C.增益稳定
D.功率放大器的线性度高
答案
参考答案:A, B, C, D
对地球站发射系统的主要要求是:()。
A.发射功率大
B.频带宽度500MHz以上
C.增益稳定
D.功率放大器的线性度高
参考答案:A, B, C, D
选用方框中适当的句子完成对话。 | |
A: What's that over there? B: 1 A: Over there, on the table. B: 2 A: That's my favorite food. What about you? B: 3 A; Are you hungry now? B: 4 A:I have milk here. Do you like it? B: No, thanks. My favorite drink is tea. A: Oh, there's lots of tea. 5 B: Thanks a lot. A: You're welcome. | |
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