用化学方程式回答：

①为什么不能用铁制容器配制波尔多液（由硫酸铜、生石灰和水配制而成）____ ？

②工业炼铁的原理　____ ．

Hi! I'm Wendy. There are four members in my family. They are my father, my mother and me. The fourth one? Oh, that's my little dog. Its name is Ben. Ben is three years old. It always runs in the garden. It loves bones. My father is a doctor. He often listens to music at night. My mother likes watching TV.

The list includes many British guests.

某同学利用图示装置，验证以下两个规律：

①两物块通过不可伸长的细绳相连接，沿绳分速度相等；

②系统机械能守恒．

P、Q、R是三个完全相同的物块，P、Q用细绳连接，放在水平气垫桌上．物块R与轻滑轮连接，放在正中间，a、b、c是三个光电门，调整三个光电门的位置，能实现同时遮光，整个装置无初速度释放．