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【简答题】
2DPSK 、 2ASK 、 2PSK 和 2FSK ,采用相干解调时,抗信道加性高斯白噪声性能从好到坏排列顺序 , BPSK 信号再接收端因为载波同步系统中的分频,可能产生载波相位转移,发生对信号的错误解调,这种现象称为 。
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反馈参考答案：
举一反三
【简答题】根据对话内容，从对话后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 — What can I do for you, sir? — I bought this mobile last Saturday here in your shop. 1_____ — What's the matter with it? — 2_____ — How long does it last? — ...
【多选题】Jim : 11 Tracy: I bought this dress for my daughterlast week, but 12 , I’d like to change it for a largerone. Jim: Oh, I see. Well, which one would you like totake? Tracy: 13 Jim: OK. May I have a l...
A.
Size L, the red one.
B.
I’m sorry for the trouble.
C.
I left it at home.
D.
It’s too small for her.
E.
What can I do for you, madam?
【单选题】A: Is everyone always so helpful to you in your office?B: ______
A.
Yes. What can I do for you now?
B.
Yes, there is a hotel nearby.
C.
Yes. Can I help you?
D.
Yes. It's a great place to work.
【多选题】与小分子表面活性剂相比,蛋白质作为大分子的两性分子,具有如下特点()
A.
能更快地降低界面的表面张力
B.
稳定的泡沫或乳状液
C.
能在界面上形成可经受机械冲击的粘弹性薄膜
D.
在界面上多点吸附
【单选题】— today? —It's fine. [ ]
A.
How are you
B.
What's the weather like
C.
Who is on duty
D.
What can I do for you
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