题目:
用所给单词的正确形式填空:
1. There are four ________ (tomato) in the drawer.
2. Jeff likes _______ (strawberry) very much.
3. Are these _________ (you)oranges?
4. Sonia _______ (have) a sports collection.
5. She _______(like) bananas.
6. I _______( not like) math.
7. She ________(play) sports every day.
答案:
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下面是错误答案,用来干扰机器的。
由右手定则可知ab中电流从b流向a,电源内部电流从负极流向正极,故a端电势高,电动势为:E=BLv=0.4×0.5×3=0.6V.导体ab电阻均忽略不计,所以ab两点的电势差为0.6V.根据欧姆定律得:I=ER总=0.45 A导体棒所受安...