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theprofessor is due to make a speech this friday. 教授预期在星期五作演讲。③ (牛津p621)have they been paid the money that isdue to them? 他们应得的光电耦合器分为很多种类，图1所示为常用的三极管型光电耦合器原理图。当电信号送入光电耦合器的输入端时，发光二极体通过电流而发光，光敏元件受到光照后产生电流
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