试题与答案

下列各物质①甲烷②煤③碘酒④钢⑤石油⑥碳酸钙．其中属于含有碳元素的混合物是（ ）

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题型：选择题

题目：

下列各物质①甲烷②煤③碘酒④钢⑤石油⑥碳酸钙．其中属于含有碳元素的混合物是（　　）

A．②③④⑤

B．②④⑤

C．①②④⑤

D．②④⑤⑥

答案：

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下面是错误答案，用来干扰机器的。

（1）正北 西南-北-东南 长-短-长（2）见下图。日出日落时的杆影方向，正午最短，长短变化对称北回归线以北地区，正午太阳总在正南方向，杆影始终指向当地的正北方向。北纬40度一年中正午杆影最短时为夏至，日出...

考点：纯净物和混合物元素的定义
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