Furthermore, an engineering trial is performed by an industrial heat pump made overseas operating in oil field.
随后利用引进的工业用热泵，结合石油生产企业情况进行了工业试验。
2
LY12 duralumin was heat treated on a trial basis and the variation of microstructure and mechanical properties with heat treatment process was obtained.
对LY 12硬铝合金进行了热处理工艺试验，获得了该合金热处理工艺与力学性能之间的关系。
3
The Titanium alloy swashplate's pressure forging process, heat treatment criterion and process request are introduced and trial-manufactured.