【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。（ ）
①
正确
②
错误
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阳光中的紫外线照射到皮肤上可生成( )。
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随机题目
【单选题】
梨果套袋的最佳时间为上午（），下午（）
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A6：30-10：30；2：00-6：00
②
B8：30-11：30；5：00-6：00
③
C8：30-11：30；2：00-6：00
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