backpressure regulator self-contained是什么意思?
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backpressure regulator self-contained是什么意思?
自动调节的反压力调节阀
backpressure regulator self-contained是什么意思?
A n-faced regulat polyhedron consists of 2n edges and (2n-4) vertices.find the n 这是我一个香港朋友的题,
英语翻译When open- or tandem-center valves are used in circuits requiring pilot pressure to shift the valves,there must be a means of maintaining pressure when the valves are in neutral.One method is to install a backpressure check valve in the t