电阻元件上任一瞬间的电压电流关系可表示为()。
参考答案:u=iR
看图,将图的序号填在相应的句子前面。
A. B.
C. D. E.
( ) 1. I do my homework on Saturday.
( ) 2. I read books on Tuesday.
( ) 3. I watch TV on Friday.
( ) 4. I often play football with Li Ming on Wednesday.
( ) 5. I like to eat good food.
通过网络获取的信息需要甄别,通过电视、广播、报纸获取的信息不需要甄别。