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一、选择题(每题3分,共15分)1郾我国于1997年颁布的噪声标准规范中规定:在城市中的允许值为()。A郾昼间75dB,夜间65dB;B郾昼间65dB,夜间55dB;C郾昼间55dB,夜间45dB。2郾脚手架安全技术规范规定:用作承重架和装修架的施工荷载值分别为()。A郾3郾0kN/m2和2郾0kN/m2;B郾3郾5kN/m2
First, the multiple-choice questions (each question 3 points, a total of 15 points) 1 郾 China promulgated in 1997 noise standard specification: the allowable value in the city (). A 郾 75dB during the day and 65dB at night; B 郾 65dB during the day and 55dB during the night; C 郾 55dB during the day and 45dB during the night. 2 郾 scaffold safety specification: load-bearing construction and installation of the value of the load were (). A 郾 3 郾 0kN / m2 and 2 郾 0kN / m2; B 郾 3 郾 5kN / m2