PT C材料经过在开关温度及其以上的较宽温度范围内重复热循环后，室温电阻升高，PTC强度降低。
On repeated heating cycling through the switch temperature or above it, the room temperature resistivity rises and the PTC intensity decreases.
对采用硅酸铝保温的淬硬倾向大的低合金高强度钢的焊接区域不同部位的焊接热循环进行了研究。
The investigation into the thermal cycles at different zones of a weld on HSLA steel with hardened tendency with aluminium silicate as thermal insulator are carried out completely.
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