题目内容
当Arduino以5V供电时，会将1V的输入电压作为低电平识别。
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当Arduino以5V供电时，会将2.5V的输入电压作为高电平识别。
使用analogWrite( )函数来实现模拟输出功能。 但是该函数并不是输出真正意义上的模拟值，而是以一种特殊的方式来达到输出模拟值的效果，这种方式叫做脉冲宽度调制(Pulse Width Modulation).
Serial. print(val);使用串口输出数据，并在输出完指定数据后，再输出一组回车换行符。
1.This system could deliver services to local communities more______.(effective,effectively)2.His comments sparked an angry______from dissatisfied customers.(respond,response)3.Checks are made to______whether applicants have a criminal record.(discover,discovery)4.If any of these symptoms______while you are taking the medicine,consult your doctor immediately.(occur,occurrence)5.The museum is full of______and precious treasures.(rare,rarely)6.Do you agree with the use of animals in______experiments?(science,scientific)
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