【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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【单选题】
使用紫外线灯消毒时紫外线强度不低于（）
①
50μW/cm<sup>2</sup>
②
60μW/cm<sup>2</sup>
③
70μW/cm<sup>2</sup>
④
80μW/cm<sup>2</sup>
随机题目
【单选题】
下面路基施工项目中不能在冬季进行施工的是（）
①
A、含水量高的流动土质，流沙地段的路堑开挖
②
B、河滩地段开挖基坑修建防护工程
③
C、泥沼地带的换填土
④
D、挖填方交界处，填土低于1m的路堤施工
【单选题】
对于原地基处理，下面说法不正确的是（）
①
A、路基用地范围内的树根均应在施工前全部挖除
②
B、地面横坡为1：5—1：25 时原地面应挖台阶，台阶宽度不应小于2m
③
C、高速公路、一级公路和二级公路路堤基底的压实度应不小于90％
④
D、在非岩石地基上填筑填石路堤前，应按设计要求设置过渡层
【判断题】
根据《城镇燃气设施运行、维护和抢修安全技术规程》CJJ51－2006规定：燃气设施维护、检修或抢修作业完成后，应进行全面检查，合格后方可进行置换作业。
①
正确
②
错误