GB/T 31070.2-2018楼寓对讲系统第2部分:全数字系统技术要求国家标准
英文:Building intercom systems—Part 2: Technical requirements for digital building intercom systems GB/T 31070.2-2018介绍: 国...
英文:Building intercom systems—Part 2: Technical requirements for digital building intercom systems GB/T 31070.2-2018介绍: 国...