【判断题】【消耗次数：1】
低剂量照射紫外线，对微生物几乎没有影响，但以超过某一阈值剂量的紫外线照射，则会导致微生物的基因突变。
①
正确
②
错误
参考答案：
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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( )。
①
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②
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③
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④
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随机题目
【单选题】
钢结构在搭接连接中，搭接的长度不得小于焊件较小厚度的（）。
①
7倍，并不得小于35mm
②
4倍，并不得小于20mm
③
6倍，并不得小于30mm
④
5倍，并不得小于25mm
【单选题】
已知土的内摩擦角为0 45，滑动面上的法向应力为100Kpa，土的粘聚力100Kpa，则由库仑定律可求得抗剪强度。（ ）
①
200Kpa
②
400Kpa
③
100Kpa
④
300Kpa
【单选题】
下列哪项不是学前儿童心理学的学习目标( )。
①
掌握青少年的心理发展规律
②
理解个体心理发展的基本观点
③
理解学前儿童心理学的研究方法
④
了解学前儿童心理学的研究对象和任务