粉末冶金(图5.1)采用烧结工艺将金属粉末制成各种各样的零件。金属粉末放在封闭的金属腔(模具)中在压力下被压实。
Powder metallurgy (Fig. 5.1) USES sintering process for making various parts out of metal powder. The metal powder is compacted by placing in a closed metal cavity (the die) under pressure.
烃类生成、压实作用，蒙脱石脱水，水热增压及地层的封闭性是产生高压油气藏的主要原因。
The major causes of abnormally high pressure oil-gas pools are hydrocarbon generation, under compaction, montmorillonite dehydration, hydrothermal-pressure increasing and sealing.
证明了任一环有代数封闭的扩张环，且实封闭域上的四元数体是代数封闭的，给出了代数封闭环的若干性质。
The two theorems are proved that any ring can be extended into an algebraically closed ring and that the quaternionic skew field over a real closed field is algebraically closed.
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