阐释
发表于 2025-4-1 03:47:05
Conference proceedings 1960. His work, however, was not of an isolated nature. It was conceived eighteen years after air had, for the first time, been liquefied in the laboratory by Pictet in Geneva and Caillete in Paris. Linde‘s liquefaction of air was followed by Dewar‘s work on hydrogen liquefaction in London and by the se
评论性
发表于 2025-4-1 08:48:28
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Debrief
发表于 2025-4-1 10:30:37
Canadian Music and American Cultureditional disadvantages are that the vacuum space is exposed to the atmosphere and that loss of residual vacuum results during the replacement of the seal-off tubing. A complete valve is objectionable because it is often an awkward protuberance on a small piece of apparatus.