阶梯倍投是否合理简介：He has ready-made high-concentration alcohol in his hand, which is very convenient for making ethanol. Now he has sulfuric acid and glass bottles, and he has reached the most basic experimental conditions.
He has ready-made high-concentration alcohol in his hand, which is very convenient for making ethanol. Now he has sulfuric acid and glass bottles, and he has reached the most basic experimental conditions.
