【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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【单选题】
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】
关于文献的引用，下述说法错误的是（ ）
①
必须引用正规渠道来源及公开出版的文献
②
最好引用来自权威刊物及人物的文献
③
不要间接引用他人的文献
④
文献中的【M 】代表出版的月份
⑤
最好引用5年以内的文献
【单选题】
在PubMed中进行词组检索时，不能强制将blood pain 作为一个词组进行检索的是（ ）
①
blood pain
②
[blood pain]
③
blood pain[tw]
④
blood-pain
⑤
blood pain*