I have a computer,________I don’t play computer games on it.A. also B.only C.but D.and
(16分)如图所示,两根足够长、电阻不计的光滑平行金属导轨相距为L=1m,导轨平面与水平面成=30°角,上端连接的电阻.质量为m=0.2kg、阻值的金
There is a blackboard ________ our classroom. Our teacher was standing ________ the blackboard at this time yesterday. A. in front of; in the
another button and your meal is prepared and heated for you. A.If press B.When press C.Press D.Pressing
如图15(a)所示电路,电源电压保持不变,滑动变阻器R2上标有“50W 2A”字样,闭合电键后,当滑片位于中点位置时,电流表A1和A2的示数均如图15(b)
在探究摩擦力的实验中,用弹簧测力计水平拉一放在水平桌面上的小物块.小物块的运动状态和弹簧测力计的示数如下表所示.下列说法正确的是( )
“众口铄金、积毁销骨”与“谎言重复千次,就会变成真理”共同说明的是 A.真理与谬误有确定界限 B.真
5.右图中,a、b、c分别表示3种细胞外液,箭头表示3种液体之间的相互关系。下列各项中正确的是( ) (1)液体a的蛋白质含量最高