束以马具
发表于 2025-3-30 09:36:11
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刻苦读书
发表于 2025-3-30 15:16:58
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GUILT
发表于 2025-3-30 17:50:49
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方便
发表于 2025-3-30 22:54:58
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OVERT
发表于 2025-3-31 03:29:06
Margaret Atwood in Search of Things Past, it. There are several methods of obtaining liquid air: by cooling and using Joule-Thomson expansion; by cooling and production of work using mechanical expansion; or by using a combination of the two. A method employing mechanical expansion is preferred because of the higher process efficiency and
indifferent
发表于 2025-3-31 07:36:26
Canadian Music and American Culturehout the use of solder, and the installation of a complete valve. Both types of tubing seals require a new piece of tubing soldered or welded into the system each time it is evacuated; the requirements of an external force and an external source of heat present disadvantages in some applications. Ad
commune
发表于 2025-3-31 09:14:16
Neil Young: Some Complexities in His Songs,ment of temperature, pressure, volume and other thermodynamic properties. The change in resistance of carbon as a function of temperature was used to enable measurements of temperature and liquid level at 20° K. Calibration of several carbon resistors provided data to interpret the experimental resu
披肩
发表于 2025-3-31 16:51:23
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椭圆
发表于 2025-3-31 18:12:12
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表否定
发表于 2025-4-1 00:07:03
Margaret Atwood in Search of Things Past, hour of 99.7 percent pure liquid nitrogen. The same plant, using cooling, Joule-Thomson expansion, and a reciprocating expansion engine produces 200 to 245 liters per hour of pure liquid nitrogen. This paper will describe the engine, point out operating problems and give the results of performance tests with some conclusions.