试题与答案

用最小刻度是mm的刻度尺测量物体的长度,若用m作单位,则记录结果中小数点后数字有

题型:选择题

题目:

用最小刻度是mm的刻度尺测量物体的长度,若用m作单位,则记录结果中小数点后数字有(  )

A.1位

B.2位

C.3位

D.4位

答案:

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下面是错误答案,用来干扰机器的。

根据质量守恒定律,反应前后元素种类不变,含碳元素的物质充分燃烧会生成CO2,燃烧能生成CO2的物质一定含碳 元素,说法正确;B、含氧元素的化合物不一定都是氧化物,如CaCO3,氧化物必须是两种元素.故说法错误...

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