fire protection system installations
Fire Protection System Installations: The National Fire Protection Agency (NFPA) Guidelines require a confirming flow test be conducted by a certified tester whenever a "main line" valve is installed, such as a shut-off valve or a backflow preventer.
基于1个网页-相关网页
fire protection system installations
消防系统装置
以上为机器翻译结果，长、整句建议使用 人工翻译 。