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咨询: GBT 16851-1997 应急声系统 Sound systems for emergency purposes 电话:400 810 0369(当地市话费) ; MSN & E-mail:zxd711020@hotmail.com gbstandard@hotmail.com chinastandard@hotmail.com ; QQ:158894832 / 1041554835 / 158894832 |
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咨询: GBT 16851-1997 应急声系统 Sound systems for emergency purposes 电话:400 810 0369(当地市话费) ; MSN & E-mail:zxd711020@hotmail.com gbstandard@hotmail.com chinastandard@hotmail.com ; QQ:158894832 / 1041554835 / 158894832 |
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