GB/T 31070.3-2021楼寓对讲系统第3部分:特定应用技术要求标准
英文:Building intercom systems—Part 3: Technical requirements for specific applications GB/T 31070.3-2021介绍: 国家标准《楼寓对讲系统 第...
英文:Building intercom systems—Part 3: Technical requirements for specific applications GB/T 31070.3-2021介绍: 国家标准《楼寓对讲系统 第...