城市气体消耗多时,向城市的供气量大于干线的流量,不够的气体由末段中积存的气体来弥补,使末段压力下降。If ur...
未知题型城市气体消耗多时,向城市的供气量大于干线的流量,不够的气体由末段中积存的气体来弥补,使末段压力下降。If urban gas consumption is too long, the gas supply to the city is larger than the flow of the main road, and the insufficient gas is made up by the