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有一固体有机物极易溶于热的乙醇中,但难溶于冷的乙醇中,问这种固体...
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试从HA酸在电离过程中的能量变化分析影响其酸性强度的一些主要因素...
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现有失去标签的体积相同的两瓶液体,一瓶是98%的浓硫酸,另一瓶是...
Saturday, September 17, 2022
Saturday, September 17, 2022
下列化合物即能产生顺反异构,又能产生对映异构的是()。...
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两种油脂A和B,A的皂化值大于B,而A的碘值只是B的1/7左右,...
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能与饱和NaHSO<sub>3</sub>溶液呈阳性反应的醛酮有...
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生物碱呈()性,()溶于水,能发生()反应和()反应。...
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可区别葡萄糖和果糖的试剂是()。A、托伦试剂B、斐林试剂C、溴水D、苯肼...
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Saturday, September 17, 2022
在同一周期中主族元素随着族数的递增,正离子的电荷数增大,离子半径...
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