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阅读下面短文 会发光的电磁翘翘板 小明制作了如图（a）所示的电磁翘翘板参加学校的科技节活动．该电磁翘翘板是在两端封闭的透明塑料管中放有一块磁性很强的磁铁，塑料管外绕有金属丝作为线圈，在线圈两端并联两只发光二极管，其电路如图（b）所示．二极管具有单向导电性，电流只能从二极管的正极流入，负极流出．演示时，将塑料管上下翘动，磁铁便在线圈中左右移动，相当于线圈导体在磁场中做切割磁感线运动，这时会看见两只发光二极管轮流发光． 请回答下列问题： （1）电磁翘翘板中发光二极管轮流发光是根据______原理工作的，______也是根据这一原理工作的（填“电动机”或“发电机“）． （2）电磁翘翘板上下翘动时，为什么发光二极管会轮流发光？
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【简答题】当 80C 51 的 RST 引脚上保持( )个机器周期以上的高电平时, 80C 51 即发生复位。
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A shocking 100 million sharks are killed every year around the world by humans．
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【单选题】当 80C51 的 RST 引脚上保持( )个机器周期以上的高电平时, 80C51 即发生复位。
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【单选题】False Fear of Big Fish Many people believe sharks (鲨鱼) are dangerous and will always try to hurt or even kill humans.____________(46). A shark exhibition at the National Aquarium (水族馆) in Baltimore, U...
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A.
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【简答题】Many people have a fear(害怕) of public speaking. According to a study, it has an influence on 3 in every 4 people. This fact is surprising and worrying, as most jobs require some speaking ability. The ...
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