This paper reviews geochemical characters, distribution, modes of occurrence and migration of Ni in coal.

本文综述了镍的地球化学特征，以及煤中镍的分布、赋存状态与迁移规律。

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Reviews the current situation of the geochemistry characteristics, distribution, modes of occurrence, mechanism of concentration, migration of chromium in coals.

对煤中铬的地球化学行为、分布、赋存形式、富集机理、迁移规律等方面的研究现状进行了综述。

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Purpose to research roles of genetic factors on occurrence of migraine without aura and hereditary modes of the disorder.

目的探讨遗传因素在普通型偏头痛发生中的作用及该病的遗传方式。

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