A:①④
B:②③
C:②④
D:③④
如图是人体某项生命活动调节过程的示意图。据图判断,下列说法中正确的是
实验室制取二氧化碳有以下几个步骤:①按要求装好仪器 ②向漏斗中注入盐酸 ③向反应器中放入块状石灰石 ④检验装置气密性 ⑤收集生成气体 以上操作正确的排列顺序是( )
— Sorry, I didn't pass the exam, and then what should I do?
—I think perhaps you should be careful next time.