银锌蓄电池是一种高能电池,它的两极材料分别为锌和氧化银,电解质溶液为KOH溶液,该电池反应的化学方程式为:Zn+Ag2O+H2OZn(OH)2+2Ag,下列判断正
Have you got any wonderful plans for your coming winter vacation? Here are some wonderful films for you to kill time. Away We Go With a baby on his way, a young couple, Burt and Verona, look a
—Why didn’t you buy the calculator? —I ______, but Mother ______ allow me. A. would want to; didn’t B. had wanted to; didn’t C. wanted to; wouldn’t D. had wanted to;
现代家庭用照明灯的控制开关S上往往有一个指示灯L1,当S闭合时,照明灯L2发光,指示灯不发光。当S断开时,照明灯熄灭,由指示灯发出的微弱光亮指
如下图所示,直三棱柱A1B1C1―ABC中,C1C=CB=CA=2,AC⊥CB,D,E分别为棱C1C,B1C1的中点。 (1)求点B到面A1C1CA的距离; (2)求二面角B―A1D―A的大小; (3
(1)在“研究匀变速直线运动”的实验中,在打出的纸带上每隔0.1秒取为一个计数点,并算出小车经过各计数点的即时速度,为了算出加速度,最合理
阅读理解 阅读短文,根据短文内容,从每小题所给的A、B、C、三个选项中,选出最佳答案。 A well-dressed(衣着很好的) man goes into a restaurant one day. He sits do
1.下列词语中加点字的注音,全都正确的一项是:( ) A.芰荷(jì) 绣腰襦(rù) 酾酒临江(shī) 将子