Abstract: root canal perforation and instrument separation are common complications of root canal therapy.

摘要根管侧穿和器械分离是根管治疗术中常见的并发症。

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The extraction and separation techniques of oligoprocyanidins(OPC) from the root of wild Sanguisorba officinalis Linn.

对吉林地区野生地榆根低聚原花青素（OPC）进行了提取分离工艺研究。

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By studying the variation of root mean square radius with the separation energy, conditions for the existence of halo states are pointed out, especially of the proton halo states.

通过研究均方根半径随结合能变化的规律，指出了晕核态存在的条件，尤其是质子晕核态存在的条件。

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