Many people think that twins are exactly the same. But some of them are not! Al and Mike are twin brothers. They look the same and in some ways they are the same. But in other ways they are different. Al and Mike are both very strong. Al and Mike both like soccer. But Al plays soccer every day and Mike plays soccer only on weekends. Mike likes watching soccer games on TV but Al only likes to play the game, not to watch it. Al and Mike are both outgoing and funny, but Mike is a little more outgoing than Al. Mike is also a little more serious about school. Al and Mike are very popular at school, and they both have a lot of friends.

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a仪器的名称是____；实验室利用甲装置制取氧气时，a仪器中所盛试剂为____（填名称）．实验结束时，为防止水倒吸，正确的操作是：先____，再____．用装置乙制取二氧化碳，反应的化学方程式为____，实验时，如果二氧化碳始终收集不满，可能的原因是____（写一种）．