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Warning: fclose() expects parameter 1 to be resource, bool given in /www/wwwroot/www.wendadaohang.com/inc/function.php on line 2475 一条电阻线最多可通过2A的电流,现在把它接在30V的电路中,通过的电流是0.5A,求它能否在220V的电路中使 - 55问答网