Many environmental problems, such as electromagnetic field and radio interference disturbance, noise pollution and wastewater, appear with the construction of extra high-voltage substations.
高压变电站的建设带来一系列的环境问题，如运行期产生的电磁场、无线电干扰、噪声污染及污废水等。
2
This invention relates to structural changing of the wastewater drain trap in housing construction and the double valve water tank of the waste water filter and sanitary ware urinal.