题目:
我国家庭电路的供电电压是______V;不高于______V的电压对人体才是安全的.有A、B两个带电体,若A与B相互排斥,而A又与带正电的C相互吸引,那么A一定带______电,B与C一定能相互______.
答案:
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Now with people’s living standard rising sharply, more and more parents are sending their young children overseas for further study, even when their children are still ve...