A:阴极只析出H2
B:阳极先析出Cl2,后析出O2
C:电解最后阶段为电解水
D:溶液pH不断增大,最后为7
小树的计算对吗?( )
完形填空。
This is a photo 1 a classroom. It's2 classroom. Look 3 the walls (墙). They4 white. You can see5old photo 6 the wall. What can you see7 the photo? This is 8 desk. 9 English book is on it. These are 10. They're on the desk too.
如图所示,两个大小相同、质量分别为mA、mB的球体,球A套在水平细杆上,球A与球B间用一轻质绳相连,由于受到水平风力作用,细绳与竖直方向的夹角为θ,两球一起向右匀速运动.已知重力加速度为g.则风力大小为____,球与水平细杆间的动摩擦因数为____.