為甚麼橋要有頂?
回答 (1)
2007-03-23 10:16 pm
✔ 最佳答案
For Carriageway Bridge - The cover is usually used to reduce the noise level that the car cause to the surrounding area. We ususlly call it a "Noise Barrier".For Footbridge - The cover is used to block the sunlight and rain to human.
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https://hk.answers.yahoo.com/question/index?qid=20070323000051KK01293