bleed valvebli:dvælv短语¹³¹⁶²⁰⁺³ 基本例句 放气阀 Open test cock No. 1 and bleed valve by opening vent needle valve. Bleed air from hose then shut vent needle valve. 开启测试旋塞1号，通过开启排气针形阀来开启排气阀。从软管排放空气，然后关闭排气针形阀。 h6688 To aid detection of bleed valve movement in noisy environments a headset has been provided. 为了保证强噪音环境下测试的准确度，系统还带有一只耳机。 iciba