试题与答案

探究二氧化碳通入紫色石蕊试液变红的原因。制作几个用紫色石蕊浸泡的纸花,设计如下实

题型:选择题

题目:

探究二氧化碳通入紫色石蕊试液变红的原因。制作几个用紫色石蕊浸泡的纸花,设计如下实验:①向纸花上喷洒白醋; ②向纸花上滴水;③将纸花烘干并放入干燥的二氧化碳中; ④将纸花放入二氧化碳中。其中必须进行的实验是

A.②③

B.③④

C.②③④

D.①②③④

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C解析:劳动力需求的自身工资弹性是劳动力需求量变动对工资率变动的反应程度。

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