题目内容：
（3）6~9时和16~18时，曲线b高于曲线a，主要原因是此时段棚内 较高。
参考答案：【答案仅供学习，请勿对照自行用药等】
选择题：(3)6~9时和16~18时,曲线b高于曲线a,主要原因是此时段棚内 较高。
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- 题目类型：选择题
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