下列装置或操作能达到实验目的的是（）ABCD_刷题宝

题干

下列装置或操作能达到实验目的的是（）

A B C D

A：稀释浓硫酸

B：探究燃烧的三个条件

C：测定空气中氧气的含量

D：探究CO₂的性质

上一题下一题 0.0难度选择题更新时间:2019-06-18 11:21:19

答案(点此获取答案解析）

D

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下列各句中，没有语病的一句是（）

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汽车是一种运输工具，关于汽车的知识下列说法正确的是（）

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下列关于氨基酸和蛋白质的叙述，错误的是（　　）

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乘数效应是一种宏观经济效应，是指经济活动中某一变量的增减所引起的经济总量变化的连锁反应程度。“乘数效应”体现的哲学道理有( )

①事物之间的相互联系构成事物的变化和发展

②自在事物的联系是客观的

③事物之间的联系是具体的、有条件的

④量变是质变发展的必然结果

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