
BS EN 12691 - FLEXIBLE SHEETS FOR WATERPROOFING - BITUMEN, PLASTIC AND RUBBER SHEETS FOR ROOF WATERPROOFING - DETERMINATION OF RESISTANCE TO IMPACT
出版:British Standards Institution

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BS EN 12691 - FLEXIBLE SHEETS FOR WATERPROOFING - BITUMEN, PLASTIC AND RUBBER SHEETS FOR ROOF WATERPROOFING - DETERMINATION OF RESISTANCE TO IMPACT
出版:British Standards Institution
專家解讀視頻