【单选题】
21在继电器中，NO接点是一种什么接点？___
A. 不使用接点
B. 不存在接点
C. 激磁后即开路的接点
D. 常开接点
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答案
D
解析
暂无解析
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B. 先输出低电平到该输入/输出端口
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29在Keil µVision3里进行调试/仿真时，在哪里操作才能触动程序中断？___
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36在12MHz的8×51系统里，哪一种方式一次可定时5ms？___
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【单选题】
___的一端连在电路中的一点，另一端也同时连在另一点，使每个电阻两端都承受相同的电压，这种联结方式叫电阻的并联。
A. 两个相同电阻
B. 一大一小电阻
C. 几个相同大小的电阻
D. 几个电阻
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