
Code Of Practice For The Assessment, Specification, Preparation, Maintenance And Operation Of Sound Systems For Emergency Purposes At Sports Grounds And Stadia In Pursuit Of Approval By Licensing Authorities
出版:British Standards Institution

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Code Of Practice For The Assessment, Specification, Preparation, Maintenance And Operation Of Sound Systems For Emergency Purposes At Sports Grounds And Stadia In Pursuit Of Approval By Licensing Authorities
出版:British Standards Institution
專家解讀視頻