Objective To investigate the liquid nitrogen freezing method of infant skin strawberry hemangioma treatment and care.
目的：探讨液氮冷冻法对婴幼儿皮肤草莓状血管瘤治疗及护理。
The brittleness of high-manganese steel under low temperature is discussed. A method of Iow-temperature cutting with liquid nitrogen freezing of the workpiece has been developed.
论述了高锰钢的低温脆性，建立了用液氮冷冻工件的低温切削方法。
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