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2026-01-16

“pump-down”的英文意思

单词 pump-down
释义 ˈpump-down
Also pumpdown.
[f. vbl. phr. to pump down: see pump v. 3.]
The action or process of reducing the pressure of air or other gas inside an enclosed volume by pumping. Freq. attrib.
1948Rev. Sci. Instruments XIX. 13/1 To obtain a conservative value for the ‘pump-down’ time, the pump speed..is 0·37 liter per second.1966D. G. Brandon Mod. Techniques Metallogr. 184 Preliminary pump-down can be performed with a liquid nitrogen-cooled sorption trap.1971Sci. Amer. Aug. 114/3 Gas will be liberated from the internal surfaces of the system during pumpdown.1977Design Engin. July 35/3 This greatly reduces pump-down time.
“pump-down”的英文意思

　

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