求助一句话的理解? slag tapping is in "manual-run" mode, all burner double-block and vent valves are powered-up and shut with their vents open with the exception of the nitrogen double-block and vent system (yv 4420, yv 4430 & yv 4440) which is open, as is the main air/nitrogen flow control valve, fc4380 排渣在"手动"方式,所有燃烧器的双块?(闸阀?)和排放阀都通电且关闭(它们的排放口开着),打开的氮气双块和排放系统(yv 4420, yv 4430 & yv 4440)除外,主空气/氮气流量控制阀fc4380也一样.(这话译出来怎么感觉不顺)查看更多