“诸男夫十五以上受露田四十亩,妇人二十亩,牛一头,受田三十亩,老免及身没则还田。初受田者,男夫给二十亩,课种桑五十株;桑田皆为世业,身终不还。”北魏政府的上述规定( )
A:体现男女平等的待遇
B:可保证农民土地的长期稳定
C:均田全部实行私有化
D:实施范围是西部的种桑地区
Sunday,June 1
Dear Tony,
Now we are having fun at Tian'anmen Square. The weather is fine. There are many people here. We'll visit the Bird's Nest and the Water Cube. In the evening,we'll have Beijing Duck. I love Beijing. I hope you will come to China soon.
Your friend,
Ben
Tony White__
78 Flower Road__
New York,CBE779D,USA
①如图所示,F1是作用在抽水机手柄A点处的动力,O为支点。请画出动力F1的力臂L1和B点处所受的阻力F2
②如图所示,为了使轻质杠杆AB在如图所示位置静止,请在杠杆上画出所施加最小力F的示意图及其力臂L
③请根据实物电路,在右边方框内画出电路图