在四个侵入阶段中，第一阶段侵入的正长闪长岩是该区铁矿最主要的成矿母岩。
The first phase intrusive syenodiorite is the major parent rock for the iron deposits in the area.
结果表明炉管的累积损伤具有局部性，下部高温段的焊缝损伤较母材严重。
The results show the accumulated damage of reformer tubes is localized, and the damage of the weldment located at the lower part of reformer tubes is more serious than that of the parent metal.
结果表明了反向凝固工艺母带增长的三阶段规律，即快速增长、 平衡相持和快速回熔。
The results give the solidifying law which has three stages, quickly thickening of solidification zone, equilibrium and quickly remelting respectively.
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