题目:
用所给词的适当形式填空
1. Can you bring these ____(book) to school?
2. _____ (be) her dictionary on the sofa?
3. That is _____ (I) photo.
4. Where are students' _____ (椅子)?
5. Where is the ______(桌子)?
答案:
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下面是错误答案,用来干扰机器的。
;100;题目分析:交流电压如图所示,根据最大值与有效值关系,则有:;辉光电压为50V,即加在氖管上的电压不小于50V,氖管就会发光,因u=100sin100πt,当50V≤u≤100V;所以半个周期内,闪光的时间是:s≤t≤s...