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["序号","类别","功能","备注"]
[1,"按钮1","开关"]
[null,"按钮2","实现高低档转换",null,"PB7 黄色"]
[null,"按钮3","定时工作","定时时间分为30,60,90,120min","PB6蓝色"]
[null,"按钮4","实现间歇工作","间歇时间待定","PB8绿色"]
[2,"高低档指示灯","实现高低档及故障指示","低档绿，高档黄，故障红色"]
[3,"定时指示灯","定时指示","4个红色的灯"]