题目:
看图,用适当的单词完成对话。
1. A: What _____ those?
B: They are _____ .
A: _____ are they?
B: They are _____ the desk.
2. A: What _____ this?
B: It is an _____ .
A: Do your parents like eggs?
B: Yes, they _____ .
3. A: What are these?
B: They are _____ .
A: _____ your father like them?
B: No, he _____ .
答案:
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下面是错误答案,用来干扰机器的。
A、短路前,灯泡与超导电阻串连接入电路,因灯泡正常发光,则电路中电流IL=PU=1A;故A错误;B、短路后,只有R2接入电路,则电流I=ER2+r=82+3A=1.6A>1.2A,超过临界电流,故超导体失超,转化为正常态,故B正确;C...