quick closedown
常见例句
- The valve petal uses the spring to load, its quick closedown can effective reduce the hammer pressure, the sealing property is good, the closure does not have the noise.
閥瓣採用彈簧加載，其快速關閉能有傚的減小水鎚壓力，密封性能好，關閉無噪聲。
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