Personnel must be thoroughly familiar with the properties and safety considerations before being allowed to handle a cryogenic liquid and its associated equipment.
在允许操作低温液体和它的相关设备之前，人员必须对性质和安全的考虑完全熟悉。
This thesis introduces the moulding technique, mechanical and thermal properties of the rigid polyurethane foams used in cryogenic insulation.
本文介绍低温绝热用硬质聚氨酯泡沫塑料的力学、热学性质及其成型工艺。
The results show that cryogenic treatment can improve the microstructure and properties of Pb brass.
结果表明，深冷处理能改善铅黄铜的组织和性能。
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