步骤：反应前称量B装置的质量；从分液漏斗中滴入足量的盐酸，当反应结束后，再次称量B装置的质量，增加的质量即为产生的CO₂的质量。（资料：2NaOH +CO₂= Na₂CO₃ + H₂O，空气中的其他成分不与氢氧化钠反应）

不改变分式的值，把$\frac{0.1x+0.5y}{0.05x-0.05y}$的分子、分母各项系数化为整数得____ ．

下图为某学生进行某实验的基本操作步骤，下列相关表述错误的是

Jerry is the kind of guy you love to work and live with. He is always happy and always has something       to say. When someone asks him how he is doing, he must reply, “If I         any better, I would be twins! ”

Jerry is an         manager because he has several waiters who have followed him around from restaurant to restaurant. The reason the waiters follow him is his          to life. He always         others. If a waiter is having a bad day, Jerry is there telling the waiter how to        the positive side of the situation.

I was very curious(好奇的) about his positive attitude,        one day I went up to Jerry and asked him, “I don’t get it! You are a positive person      . How do you do it? ”

Jerry replied, “Each morning I          and say to myself, ‘Jerry, you have two choices(选择) today. You can choose to be happy or you can choose to be unhappy. ’I choose to be happy. Each time something bad happens, I can choose to be a victim (牺牲品)or I can choose to learn from it. I choose to learn from it. ”

Life is all about choices. Please remember: “You are what you       . ”

材料一：“外争主权，内除国贼”、“废除二十一条”、“拒绝在和约上签字”、“誓死力争，还我青岛”等口号。

材料二：如图，***早期组织成立示意图

材料三：13名代表，五十多位党员，星星之火，终成燎原；90年艰苦辉煌，60余年国运昌隆，气壮山河，声震寰宇！90年前，***为黑暗的中国点起了一盏明灯，照亮了漫漫革命之路；90年后，《建党伟业》追本溯源，去寻找和讲述光明源头的故事。

——《建党伟业》中的特殊数字解读