1.不定代词后面只能用THAT
2.先求出 电路最大承受阻值为 4.5V除以0.6A=7.5欧
1.由这个得到的滑动电阻阻值最小为7.5-6=1.5欧
2.电压表最大为3V ,即R2：R1最大比为 2“1,那么R2最大为 12欧
3.在根据 R1最大接受电流为0.5A 可知 电路的电流不能大于0.5A,所以总阻值4.5/除以0.5=9欧 9-6=3欧,及说明这个条件下的R2阻值应该不小于 3欧
综上所述 R2 范围 为 3-12欧
1,finally,the thief handed everything______he had stolen to
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