推理是化学学习中常见的思维方法。下列推理正确的是_刷题宝

题干

推理是化学学习中常见的思维方法。下列推理正确的是（）

A：某物质在氧气中燃烧后生成二氧化碳和水,则该物质中一定含有碳、氢、氧三种元素

B：不饱和溶液转化为饱和溶液后,溶质质量分数一定增大

C：氧化物含氧元素,含氧元素的物质一定是氧化物

D：用湿润的pH试纸测柠檬汁的pH值,测量结果会偏大

上一题下一题 0.0难度选择题更新时间:2017-11-15 08:55:12

答案(点此获取答案解析）

D

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THEME PARKS – FUN AND MORE THAN FUN

Disneyland will bring you into a magic world. As you walk around Disneyland, you may see Snow White and Mickey Mouse in a parade or on the street. If you want to have fun and more than fun, come to Disneyland!

Dollywood, in the beautiful Smoky Mountains in the southeastern USA. Although Dollywood has rides, the park’s main attraction（吸引力） is its culture. You can even take a ride on the only steam-engine train still working in the southeast USA. Come to Dollywood to have fun learning all about America’s historical southeast culture!

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Some theme parks are not only for fun but also educational. Take the Polynesian Cultural Center(PCC) in Hawaii as an example. It not only shows visitors the Polynesian way of life but also protects their skills and culture for the future.

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已知圆锥的母线长是10，侧面展开图是半圆，则该圆锥的侧面积为____.

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下图反映的是新中国在20世纪五六十年代农业经济发展状况，出现图中B点到C点这一变化的主要原因是（）

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