h an H-beam steel H形钢条。 an H-Post H形电杆。 drop one's h's 不发h音〔如伦敦方言中把 hat 读作'at 〕。 H hour 【军事】发起攻击的时间;特定军事行动开始的时刻。 = 【电学】 henry; 【化学】 hydrogen; 【物理学】磁场密度 (intensity of magnetic field), 地磁水平分量 (the horizontal component of terrestrial magnetism); 〔表示铅笔芯硬度的符号〕= hard(ness); 〔俚语〕heroin. H1 = 【化学】protium. H1+ = 【物理学】proton. H2 = 【化学】deuterium. H3 = 【化学】tritium.
For a maximal subgroup m of a finite group g the normal index of m is the order of a chief factor h / k where h is minimal in the set of supplements of m in g . in this paper we can obtain some results about solvability and supersolvability by using the normal indexes of maximal subgroups of finite groups 有限群g的极大子群m的正规指数是指g的主因子h k的阶,其中h为m在g中的极小正规补。本文利用正规指数的概念,获得有限群可解,超可解的若干结果。