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试题答案

本文从以下几个角度介绍。

    1、2024高三押题卷历史大题
    2、2024~21年度模拟压轴卷新高考历史二
    3、2024年全国高考冲刺压轴卷二历史
    4、全国卷历史25题
    5、2024高考历史卷2
    6、高考历史25题研究
    7、2024年高三历史试卷
    8、高考历史2024全国卷二
    9、2024年高考卷历史答案全国卷一二三
    10、高考历史25题考点

3、高三2025届高考押题卷(一)1地理试题


3、高三2025届高考押题卷(一)1生物试题


3.What type of book does Sandy like best
Harty Pouer
A
B
4.What does the boy need to buy
A.
5.Where are the two speakers


One day, he found three lost bear cubs when he was patrolling. The cubs ran to him on the snow-covered riverbed and stopped short at a safe distance（距离） to look at him. After finding out that the man was not their mother, the little bear cubs turned around and ran along the river calling for Mom.
This was Gelek Gyatso's first time meeting bear cubs lost from their mother. With the information about wild animals, he drove the cubs to an area near their cave（洞穴） in the hope of seeing the cubs' mother. He also gave them some food. Thankfully, after about 10 hours, the cubs found their mother.
"It's good to see that the little cubs are back in their mother's arms, "Gelek Gyatso said. " Over the years, I have seen great changes in the ecological environment of my hometown. The number of wild animals has become bigger and everyone is taking part in the protection of the animals. I feel happy that I can help those little cute animals. "
51．Who is Gelek Gyatso？
52．What did the cubs do after finding out that Gelek Gyatso was not their mother？
53．Where did Gelek Gyatso drive the cubs？
54．Are there more wild animals in Gelek Gyatso's hometown than before？


6、高三2025届高考押题卷(一)1物理试题


6、高三2025届高考押题卷(一)1英语试题


3、高三2025届高考押题卷(一)1英语试题


6、高三2025届高考押题卷(一)1历史试题


3、高三2025届高考押题卷(一)1英语试题


6、高三2025届高考押题卷(一)1地理试题


12
13
15
14
11.山梨酸是一种高效安全的防腐保鲜剂。其合成反应如下，下列说法正确的是
CH3CH==CHCHO(巴豆醛)+CH2(COOH)2(丙二酸)　　CH3CH==CHCH==CHCOOH(山梨酸)
A.巴豆醛与丙二酸生成山梨酸属于取代反应


17．(1) 1.5
(2) 阳离子 6.2
(3) 0.6mol 3.36L
【详解】（1）由图可知，通入氯气一极为正极，Ag为负极，总电极方程式为：；转移1mol的电子，右侧氢离子与氯离子都增加1mol，则右侧总的盐酸的物质的量为2L×1mol/L+1mol=3mol，则浓度为；
（2）肼中N从-2价升高为0价，发生氧化反应，为负极，电极反应式为；N膜中发生了Na+从左到右的转移，因此为阳离子交换膜；正极反应式为，同时转移进入4个Na+，因此当转移0.2mol电子时，质量增加：molO2与0.2molNa+共mol×32g/mol+0.2mol×23g/mol=6.2g；
（3）在酸性二甲醚燃料电池中加入硝酸，电池工作时，二甲醚失去电子被氧化为二氧化碳，则Pt电极为电池的负极，电极反应式为；正极硝酸得到电子被还原为NO，电极方程式为，若电池工作时，无有毒气体放出，则发生，根据关系式，每消耗46g二甲醚(1mol)时，通过质子交换膜的离子的物质的量是12mol，需通入3mol，其标准状况下的体积是67.2L，则当消耗2.3g二甲醚时，通过质子交换膜的离子的物质的量是0.6mol，需通入标准状况下的体积是3.36L。
18．(1) 2NA


3、高三2025届高考押题卷(一)1化学答案