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【单选题】
要把不规则的矩形波变换为幅度与宽度都相同的矩形波,应选择( )电路A.
多谐振荡器
B.
基本 RC 触发器
C.
单稳态触发器
D.
施密特触发器
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举一反三
【简答题】完型填空。 I was always complaining about wind or rain. 1 it was nothing unusual for the arrival of wind or rain, it caused inconvenience for me to go out, and sometimes it even created an awful atmosphere...
【简答题】完形填空。 I was always complaining about wind or rain. 1 it was nothing unusual for the arrival of wind or rain, it caused inconvenience for me to go out, and sometimes it even created an awful atmosphere...
【简答题】High tides used to attack Kiribati when there was strong wind or heavy rain.
【单选题】Although the wind has ________, the rain remains steady, so you still need a rain coat. [ ]
A.
turn up
B.
gone back
C.
died down
D.
blown out
【简答题】Such facts as rain, snow, storm and wind are all (phenomenon) ________ of nature.
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