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The solution is degassed by alternately freezing, evacuating and thawing.
通过交替的冻结 、 抽空和溶化来使溶液除气.
辞典例句
Cold - cathode gages cannot be degassed as easily or as rapidly as hot - filament tubes.
冷阴极压力计不能像热丝管那样容易和迅速地排气.
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