题目

如图所示装置也可用来测定空气中氧气的含量．对该实验认识不正确的是（ ） A．红磷的量不足会影响实验结论 B．装置不漏气是实验成功的重要因素之一 C．将红磷改为碳也能得到正确的实验结论 D．钟罩内气体压强的减小会导致水面的上升 答案：【考点】空气组成的测定；测定空气里氧气含量的探究． 【专题】压轴实验题；简单实验方案的设计与评价． 【分析】本题考查了空气中氧气的含量测定实验的现象、结论、操作注意事项和误差分析等方面的问题，以及磷和碳的燃烧知识等．分析时将其综合起来分析考虑，便可得出正确的答案． 【解读下面的信，回答后面的问题。To: Julia@penpal.com From: Liu Ming@penpal.com Dear Julia,       England must be fun! I live in China with my parents and my little brother. My mom is a nurse. She likes reading newspapers. My dad is a computer expert. He likes watching TV. My little brother is only 3. He likes playing with his dolls. I'm a student. I like drawing pictures and collecting stamps. 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Your new friend, 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Liu Ming1. What is Liu Ming's hobby? ________________________________________________2. What is his mother's hobby? ________________________________________________3. What is his father's hobby? ________________________________________________4. What is his brother's hobby? ________________________________________________5. What is his mother? ________________________________________________