下列是某实验中的三个电路图,请仔细观察后回答。⑴ 该实验探究的问题是________________;⑵ 你的结论是____________________;⑶小明同学探究出的结论是:在并联电路中,干路电流大于任何一条支路的电流。小宁的结论是:在并联电路中,干路电流等于各支路电流之和。请你评估一下,谁得出的结论更加确切?答: ;为什么?答: 。5. (2015 .北京昌平二模) 一Do you know ? —Many years ago,I guess. A. when did they build the hospital B. when they built the hospital C. when do they build the hospital D. when they build the hospital