Using the F hypercenter of minimal subgroups, this paper gives a sufficient condition under which a soluble group belongs to a given formation F.
设F是任一子群闭的局部群系,利用极小子群的F超中心性,给出一类可解群属于F的一个充分条件,由此得到一些群的结。
DAST is one of the most important fluorinating agents in this century. This paper has summarized the recent advances in the formation of C-F bond by DAST.
DAST试剂是本世纪开发的最重要的氟化试剂之一,本文综述了利用该试剂形成碳-氟键的新进展。
The F-8 drifted out of formation but returned to within 5ft of PR-32's port wing at the same altitude.
这架歼八飞离了编队,但是又回到PR—32舱门方相同高度距离5英尺的地方。
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