发布时间:2025-01-17 05:49:44
噪声有很多种类型;
低频噪声,即使噪声值较小,人耳感觉仍然很难听,且能够传很远。
冰箱噪声国标规定的测点在冰箱的前后左右各一个,如果在前面测声压级的话,测点位置为冰箱高度加1米后除以2,测点高度;冰箱长度除以2后加1米;两个数值确定测点位置。
且冰箱产品名牌上面标注出来的噪声值指的是“声功率级”,而不是“声压级”。
建筑面积在4000平米的酒店宾馆需要建设工程消防设计审核申报吗
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2025-01-17 05:49:44 2025-01-17 05:49:44 2025-01-17 05:49:44 2025-01-17 05:49:44 2025-01-17 05:49:44 2025-01-17 05:49:44 2025-01-17 05:49:44 2025-01-17 05:49:44想在茂名高州市区买一套二手旧房61平方15万有房产证能过户值得入手吗
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