题目内容
(请给出正确答案)
[主观题]
自力式调节阀:由主调节阀、指挥阀和阻尼嘴等组成Self-operated regulating valve: composed of main regulating valve, command valve and damping nozzle.
提问人:网友xiaoyangboy
发布时间:2022-01-07
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