pressure-reducingBNC²³⁶²¹³⁺¹ 例句 Taps, cocks, valves and similar appliances for pipes, boiler shells, tanks, vats or the like, including pressure-reducing valves and thermostatically controlled valves. 用于管道、锅炉、罐、桶或类似品的龙头、旋塞、阀门及类似装置，包括减压阀及恒温控制阀。 china-customs