... design load 预设载重；预设荷载 design pressure 预设压力 design safety factor 预设安全系数 ...
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故统称为压力预设通气 Pressure Preset Ventilation ; PPV
压力预设型通气 pressure preset ventilation ; PPV
统称为压力预设型通气 pressure preset ventilation ; PPV
首先关闭位于进水阀之前的手动关闭阀，然后将系统压力降到12psi(或其他预设压力)，几个小时后，观察系统的压力上升状态。
First close manual shutoff located before the fill-valve, then draw system pressure down to 12psi (or other preset pressure) and observe system for pressure buildup several hours later.
预设生活用水的水量的压力足以支撑给排水和洁具系统的使用要求。
It's supposed that water capacity and pressure of domestic water is adequate to meet the requirement of plumbing and sanitary system.
该型号25逆转继电器是专为应用程序要求的输出，等于减去一个变量信号压力手动预设弹簧负载。
The Model 25 Reversing Relay is designed for applications requiring an output that equals a manually preset spring load minus a variable signal pressure.
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