Anyone can help to solve this problem?A factory produces a noise of 90dB(A) at nearby dwelling.
if the noise source is reduced by 5dB(A),what is the resultant noise level and what is the noise reduction at the dwelling?
人气：148 ℃ 时间：2020-03-27 23:41:39
解答
哈哈,看来点找个英语好的人才能帮你
本人英语上学时从没超过40分,帮不上你了
---不过你这个问题,太牛了,玩知道这么长时间了头一次看见你这样的问题,服了你了.
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