... percolation渗透〔作用〕 percussive piling noise撞击式打桩噪音 perennial crop多年生作物 ...
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percussive e piling noise 撞击式打桩噪音
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A valid Construction Noise permit issued by the Environmental Protection Department is required for the carrying out of percussive piling during the permitted hours.
如须于核准时间内进行撞击式打桩工程，必须事先取得由环保署签发的建筑噪音许可证。
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