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Leakage and outgas of dewar vacuum vessel also is analysed.
杜瓦微漏孔和真空室内部材料放气使杜瓦真空度下降.
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Leakage and outgas of dewar vacuum vessel also is analysed.
杜瓦微漏孔和真空室内部材料放气使杜瓦真空度下降.
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