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实验小组用如下装置进行实验． （1）请写出上图中仪器名称：①______；②______． （2）请完成下列实验报告 实 验 步 骤 简 答 第一步：称取3g氯酸钾与少量二氧化锰混合后放入装置A的试管中，点燃酒精灯． 2KClO 3 Mn O 2 . △ 2KCl+3O 2 ↑ 第二步：加热试管一段时间后，用橡皮管连接a、b． 刚开始加热时，排出的气体不宜立即收集，原因是______． 第三步：当装置B中水面不再下降，断开a、b，移去酒精灯，将装置B中的集气瓶密封，并贴上标签备用． 第四步：读取量筒C中水的体积数并记录． 读数时，视线必须与液体凹液面的______保持水平． 在理解上述实验的基础上，请你归纳本实验的目的：（不超过20个字） ______．
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【简答题】Tom was ten years old and he was a very lazy boy. He didn’t like doing any work. He had to go to school, of course , but he didn’t study hard there and tried to do as little work as possible. His fath...
【简答题】阅读理解。 Dave was ten years old and was a very lazy boy. He had to go to school every day. He didn't like school and didn't want to do much work. His parents are doctors. They hoped that their son would ...
【简答题】Tom was ten years old, and he was a very lazy boy, He didn't like doing any work. He had to go to school of course, but he didn't study hard there and tried to do as little work as possible. His fathe...
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【简答题】阅读理解。 Jack was ten years old and he was a very lazy boy. He didn't like doing any work. He had to go to school, of course, but he didn't study hard there and tried to do little work. His father and mo...
【简答题】Jack was ten years old and he was a very lazy boy. He didn’t like doing any work. He had to go to school, of course, but he didn’t study hard there and tried to do little work. His father and mother w...
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