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国家经贸委批准《继电保护专用电力线载波收发信机技术条件》等４５项电力行业标准，其中《电力建设安全工作规程（火力发电厂部分）》为强制性标准，《采用配电线载波的配电自动化第１—４部分：总则中低压配电线载波传输参数》为标准化指导性技术文件，其余为推荐性标准。现?
The State Economic and Trade Commission approved 45 power industry standards such as “Technical Conditions for Relay Protection Specialized Power Line Carrier Transceivers”, among which “Safety Regulations for Power Construction (Coal Power Plant Part)” is a mandatory standard, and “Using Distribution Line Carriers” Distribution Automation Section 1-4: General Provisions for Carrier Transmission of Medium and Low Voltage Distribution Lines are standardized guidance documents and the rest are recommended standards. Now?