【单选题】某盆花缺水指示器电路如下图所示,下列此电路相关的功能描述不正确的是:
A.
通常土壤干燥时,湿度传感器感知到的阻值比较大。
B.
通常土壤较湿时,湿度传感器感知到的阻值比较大。
C.
555定时器的4脚为高电平时,555起振,VD闪烁亮灯。
D.
+4.5V和-4.5V,电源这么接主要是由湿度传感器本身应用条件决定的。
【简答题】阅读理解。 What is the best way to study? This is a very important question. Some of the Chinese students often study very hard for long hours. This is a good habit, but it is not a better way to study. I ...
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【简答题】阅读理解。 These days the subject of security (安全) on campus is talked about quite often. Some students' mobile phones are stolen, some students fight with and hurt one another, and others are knocked down...
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