I climbed mountains with my friends last Sunday. It was very hot. When we climbed halfway up the mountain, we were very hungry and thirsty. We decided to have a rest. My friends bought some water and fruit. I brought some bread and milk. We were very happy. Finally, we were on the top of the mountain. But my hat was flew away. I was sad

    It was a happy and sad day.

阴极射线示波管的聚焦电场是由电极A₁、A₂形成的，其中虚线为等势线，相邻等势线间电势差相等，z轴为该电场的中心轴线（管轴）．电子束从左侧进入聚焦电场后，在电场力的作用下会聚到z轴上，沿管轴从右侧射出，图中PQR是一个从左侧进入聚焦电场的电子运动轨迹上的三点，则可以确定（　　）

祠堂是族人们祭祖的地方，福建农村王姓家族还保持着家族祠堂。该家族从高至低的辈分排序中，有一组是：怀、宗、维、大，民国元年除夕主持祭祖的是“宗”字辈的王宗烨。按照宗法制，这个人在“宗”字辈中一定不是（     ）