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在现行九年义务教育三年制初中物理第二册第141页关于电磁铁的实验中，利用吸引大头针的多少判定电磁铁磁性的强弱，我认为这样做有一定不足之处。1．磁性较弱时，不易得出正确结论。2．磁性较强时，吸引的大头外往往又太多，计数时费时。3．实验操作步骤零散，不太方便。根据?
In the current nine-year compulsory education three-year junior high school physics second volume 141 pages on the electromagnet experiment, using the number of attracting pins to determine the strength of the electromagnet magnetic, I think that there are certain deficiencies. 1. When the magnetism is weak, it is not easy to draw correct conclusions. 2. When the magnetism is strong, the attracting big head is often too much and counting takes time. 3. The experimental procedures are fragmented and inconvenient. according to?