辽宁省20242025学年度(下)重点高中联合体高二年级期末检测(7月)数学答案于2025-07-09发布，目前免费查试卷答案网站已经汇总了辽宁省20242025学年度(下)重点高中联合体高二年级期末检测(7月)数学答案的各科答案和试卷，更多试卷答案请关注免费查试卷答案网站。

试题答案

本文从以下几个角度介绍。

    2、辽宁省2024-2025学年度(下)重点高中联合体高二年级期末检测(7月)数学试题


    4、辽宁省2024-2025学年度(下)重点高中联合体高二年级期末检测(7月)数学试题


    A. The first step is always the hardest. B. Where there is a will, there is a way.
    C. Lost years are worse than lost dollars. D. Every cloud has a silver (银色的) lining.
    (B)
    Lenses (镜片) are useful tools that help us see things more clearly. They are widely used in our daily lives. They can help us read small words in books and take clear photos. They are also used to help people who have trouble seeing things clearly, like those who can’t see far away or those who can’t see things up close. There are many kinds of lenses, but today we will talk about convex and concave lenses.
    Imagine you’re using a magnifying glass (放大镜) to read small words in a book. What happens when you move the glass closer to the words The letters get bigger, right That’s the power of a convex lens. Convex lenses are thicker in the middle and thinner at the sides. When light passes through a convex lens, it is brought together at a single point called the focus. This is why magnifying glasses, camera lenses, and even the lenses for some old people use convex lenses to see more clearly.
    Different from convex lenses, concave lenses are thinner in the middle and thicker at the sides. When light passes through concave lenses, it spreads out. You can find concave lenses in your daily life. For example, if you are nearsighted (近视的), your glasses probably have concave lenses. You are nearsighted because the light entering your eyes does not focus exactly on the retina (视网膜). When you wear glasses with concave lenses, the light spreads out first and then enters the eyes, allowing it to focus correctly on the retina. In this way, you can see things clearly.
    根据材料内容选择最佳答案。


    Dear Sir/Madam,


    2、辽宁省2024-2025学年度(下)重点高中联合体高二年级期末检测(7月)数学答案


    3、辽宁省2024-2025学年度(下)重点高中联合体高二年级期末检测(7月)数学答案


    5、辽宁省2024-2025学年度(下)重点高中联合体高二年级期末检测(7月)数学答案


    5、辽宁省2024-2025学年度(下)重点高中联合体高二年级期末检测(7月)数学答案


    2、辽宁省2024-2025学年度(下)重点高中联合体高二年级期末检测(7月)数学试题


    2、辽宁省2024-2025学年度(下)重点高中联合体高二年级期末检测(7月)数学答案


    鉴别试剂
    A
    乙醇、乙酸
    碳酸钠溶液
    B
    甲烷、乙烯
    酸性高锰酸钾溶液


    12.B　[1 mol乙烯和1 mol氢气发生加成反应,1 mol苯和3 mol氢气发生加成反应,故在一定条件下,等物质的量的乙烯和苯分别和足量氢气发生加成反应,消耗氢气的物质的量之比为1∶3,A错误;苯可发生加成反应,但条件困难。甲烷光照条件下发生取代反应,而苯在催化剂条件下发生取代反应。乙烯能被酸性高锰酸钾氧化,而苯不能,与甲烷、乙烯相比,苯的独特性质具体来说是易取代、能加成、难氧化,B正确;乙烷中混有乙烯,若采用通入H2与乙烯反应生成乙烷的方法除去乙烯,H2的量不容易控制,可能会引入H2杂质且反应很难发生,C错误;根据苯是平面结构,12个原子共平面,乙烯6个原子共平面,甲烷最多3个原子共平面,推出分子结构中处在同一平面内的原子最多有17个,D错误。]


    3、辽宁省2024-2025学年度(下)重点高中联合体高二年级期末检测(7月)数学答案