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【单选题】
二极管峰值包络检波适用于哪种调幅波的解调（）。A.
单边带调幅波
B.
抑制载波双边带调幅波
C.
普通波调幅
D.
残留边带调幅波
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反馈参考答案：
举一反三
【单选题】Which of the following statements CANNOT be inferred from the passage?
A.
People are increasingly able to see the damage they are doing to the ocean,but to solve th e problems,they will meet with great difficulties.
B.
By the middle of the century,the edible fish will have harmful effects on human health.
C.
Earth is not exactly named,because the ocean covers almost three quarters of the planet.
D.
High temperature can damage corals and encourage organisms to migrate towards the poles in search of cooler waters.
【简答题】阅读理解。 The Great Fire of London started in the very early hours of September 2, 1666. In four days it destroyed more than three-quarters of the old city, where most of the houses were wooden and close ...
【单选题】下列关于区段人工解锁按钮盘作用说明正确的是 。
A.
设在离控制台一定距离的室内墙面上，是控制台的主要设备之一；
B.
当轨道电路因故障不能正常解锁时，用它办理故障解锁；
C.
上面设有多个二位非自复式带铅封事故按钮；
D.
在用取消进路办法不能关闭信号时，用它也不能关闭信号。
【单选题】of the teachers in our school live in the newly-built apartment .
A.
Three fourth
B.
Three quarter
C.
Third fourths
D.
Th ree quarters
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