2016年10月19日，神舟十一号载人飞船与天宫二号空间实验室成功实现自动交会对接．如图所示，在对接过程中，神舟十一号开始向天宫二号缓缓靠拢，在按程序顺利完成一系列技术动作后，对接机构锁紧，两个飞行器建立刚性连接，形成组合体．下列说法中正确的是（   ）

如图所示，小丽同学把一根钢尺的下端固定，分别用不同的力去推它使它发生a、b、c、d各图所示的形变．若F₁=F₃=F₄＜F₂，小丽同学的下列分析正确的是（   ）

Nat lived in a small town in England. He always stayed in England for his vacation, but last year he thought, “I’m never outside this country. All my friends go to Spain , and they like it very much. So this year I’m going there, too.”
First he went to Madrid (马德里) and stayed in a small hotel for a few days. On the first morning he went out for a walk. In England people drive on the left, but in Spain they drive on the right. Nat forgot about this and when he was crossing a busy street, a bike knocked (撞) him down.
Nat lay (躺) on the ground for a few seconds and then he sat up and said,
“Where am I ?”
An old man was selling maps at the side of the street, and he at once came
to Nat and said, “Map of the city, sir ?”