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【单选题】
窄带FM和ＡＭ调制相比A.
窄带FM 包络恒定而 ＡM 包络随信号变化而变化
B.
窄带FM 包络也会随时间的变化而变化
C.
窄带ＦＭ是非线性调制，所以其已调信号带宽大于ＡＭ调制
D.
窄带ＦＭ已调信号带宽和ＡＭ调制相同，所以 窄带ＦＭ是线性调制
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【简答题】请将罗马字改写为平假名。 ne(__)
【单选题】It was the training _______ he had atschool _______ made him good jumper.
A.
what ； what
B.
that ； that
C.
what ； that
D.
that ； had
【单选题】s Hlim 和 s Flim 值是试验齿轮在持久寿命期内按 ______ ,通过长期持续重复载荷作用或经长期持续的脉动载荷作用而获得的齿面接触疲劳强度极限应力和齿根弯曲疲劳极限应力。
A.
可靠度为 90%
B.
失效概率为 1%
C.
失效概率为 99%
D.
可靠度为 10%
【单选题】It was the training made him such a good engineer.
A.
which
B.
that
C.
so that
D.
what
【单选题】It was the training he had as a young man made him such a good engineer.
A.
what; that
B.
which; that
C.
that; which
D.
that; what
【简答题】单人床的最小宽度为800，其长度一般为
【单选题】It was the training that he had as a young man ______ made him such a good engineer.
A.
what
B.
that
C.
which
D.
whoever
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