单片机中EA是什么意思?还有ET0和TR0又是什么意思? 各位小弟求帮助!

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• 单片机中EA是什么意思?还有ET0和TR0又是什么意思? 各位小弟求帮助!
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• 急.Do you think it is polite to listen quietly to other people without ___1___ change of expression(表情) on your face?_____2_____,you need to watch two Americans talk.Notice how___3___ will have many changes of expression.The listener may also say something ___4___ the other is speaking.These little remarks(话语) may be one word like “ really” or it may just be a small ___5___ like “ un-huh” or “mmm”.This is the ___6___ American listeners show that they a