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下列有机化学方程式及反应类型均正确的是（ ）
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高三下学期化学《》真题及答案
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已知C.是一种合成树脂用于制备塑料和合成纤维D.是一种植物生长调节剂用它可以催熟果实根据以下化学反应
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百合醛是一种香料可由异丁基苯经一系列的反应得到其合成路线如下请回答1写出A.和B.的结构简式A.__
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某烃A.是有机化学工业的基本原料其产量可以用来衡量一个国家的石油化工发展水平A.还是一种植物生长调节
把乙醇和浓硫酸混合加热至170℃时主要有机产物是反应的化学方程式是加热到140℃时主要有机产物是反应
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【有机化学基础模块8分】根据图示回答下列问题1写出结构简式EG2写出反应类型①⑤3写出化学方程式②④
同学们已经学习了两种典型的有机化学反应类型——取代反应加成反应写出下列反应的化学反应方程式并判断其反
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九章算术中将四个面都为直角三角形的三棱锥称之为鳖臑若三棱锥P﹣ABC为鳖臑PA⊥平面ABCPA＝3AB＝4AC＝5三棱锥P﹣ABC的四个顶点都在球O的球面上则球O的表面积为
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某中学的高二1班男同学有45名女同学有15名老师按照分层抽样的方法组建了一个4人的课外兴趣小组． Ⅰ求某同学被抽到的概率及课外兴趣小组中男女同学的人数 Ⅱ经过一个月的学习讨论这个兴趣小组决定选出两名同学做某项实验方法是先从小组里选出1名同学做实验该同学做完后再从小组内剩下的同学中选一名同学做实验求选出的两名同学中恰有一名女同学的概率 Ⅲ试验结束后第一次做试验的同学得到的试验数据为6870717274第二次做试验的同学得到的试验数据为6970707274请问哪位同学的实验更稳定并说明理由．
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对一切不等式x4+a﹣1x2+1≥0恒成立则a的取值范围是
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已知平面内＝0||•||＝1且＝则的最大值等于
若实数a满足a2+a＜0则﹣aaa2的大小关系是
△ABC的内角ABC的对边分别为abc若2bcosB＝acosC+ccosA则B＝．
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高三下学期化学
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高三下学期英语
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