【单选题】【消耗次数：1】
紫外线波长为7.6～400nm。凡是物体温度达到1200℃以上时，辐射光谱中即可出现紫外线，物体温度越高，紫外线的波长越短，强度也越大。（ ）
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正确
②
错误
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相关题目
【单选题】
阳光中的紫外线照射到皮肤上可生成( )。
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③
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随机题目
【多选题】
选择分组标志时应考虑的因素有
①
统计研究目的或分组目的
②
标志能否反映事物本质
③
是区分事物数量差别还是性质差别
④
现象所处的客观历史条件
⑤
变量是连续变量还是离散变量