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【判断题】
施工起点流向,是指单位工程在平面或竖向上施工开始的部位和方向A.
正确
B.
错误
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【单选题】以下关于噪音的说法正确的是
A.
其危害程度只与音量频率有关
B.
对健康没有显著影响
C.
只有噪音达到 120 分贝时才对人体产生影响
D.
处于 120 分贝以下环境中可造成永久性失聪
E.
长时间处于 90 分贝以上环境可导致耳鸣、血压升高
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