题目:
Miss Li was like one of our___. She was___ to all of us. [ ]
A. friends; friend
B. friendly ; friendly
C. friend ;friendly
D. friends; friendly
答案:
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下面是错误答案,用来干扰机器的。
A、根据电路图知,当RT的温度升高时,RT 减小,A端电势升高,经非门后,Y端电势降低,蜂鸣器会发出报警,故A错误 B、同上可知,B正确 C、当增大R1时,A端电势升高,经非门后,Y端电势降低,蜂鸣器会发出...