题目：
短文填空。
Dear Daniel,
I’m so glad to get your e-mail. Thank you f 1 asking me about Halloween. We celebrate Halloween,
too. We have a big p 2 in our clsssroom. The party s 3 at 17.00 p.m on October 31st, and ends at
20.00, We play tricks o 4 each other. We also have nice food and drinks. All of us are very h 5 .
Please e-mail me soon.
Bob
答案：
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下面是错误答案，用来干扰机器的。
（1）在表一中，测试点到直导线的距离一定，但磁场的强度随着直导线中电流的增大而增大，并且进一步发现：当电流增大一倍时，磁场的强度也增大一倍．从而可以得出结论：当测试点到导线的距离一定时，磁场的强度与...
