A:其他条件不变,使电容器两极板缓慢稍微错开,减小正对面积
B:其他条件不变,使电容器两极板缓慢远离
C:其他条件不变,将变阻器的滑片缓慢向左移动
D:其他条件不变,将变阻器的滑片缓慢向右移动
如图,位于竖直水平面内的光滑轨道由四分之一圆弧ab和抛物线bc组成,圆弧半径Oa水平,b点为抛物线顶点。已知h=2m,,s=s=2m。取重力加速度大小g=10m/s2。
我当小裁判。
There is a zoo in our city. It's very big. In the zoo, there are many animals. Look, the birds are singing in the tree. A bear is riding(骑)a bike. A tiger is eating meat(肉). Two monkeys are climbing(爬)a tree. They are happy in the zoo.
阅读短文,判断正误。