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. 在“手动模式”下排渣,微波炉的所有双切断和放空阀通电,除氮气双切断放空系统打开作为空气/氮气流量的主要控制阀外,其他阀门均关闭。 楼主应该结合上下文理解了,只从字面上理解的话,似乎有点不合理。查看更多