禁毒专家说它可能会结束强效可卡因吸食泛滥的局面。Drug experts say it could spell the end of the crack epidemic.警察冲进去将他拘捕并没收了可卡因。The police moved in, arrested him and impounded the cocaine.强效纯可卡因是市面上最容易让人上瘾的毒品。Crack is the most addictive drug on ...
电流滞后于电压.The current lags behind the voltage.如果输入的电压是+3伏, 那么输出的电压便是-6伏.If the input voltage is plus three , it comes out as minus six.我们用以表示电压和电流的单位分别为伏特和安培。The units in which we show voltage and current are volt and ampe...