摘要: 20世纪40年代中期.人类刚刚掌握了具有超级破坏力的核武器.它空前强大的战略威慑力让大 国为之疯狂.然而核武器虽然强大却缺少有效的投射载具.40年代末到50年代初.在日后撑起冷战高潮的洲际弹道导弹基本上还停留在琢磨V2的水平,以当时 的核武器的块头和体重.还不是这种原始的弹道导弹能受得了的.此时.充当战...
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The contemporary history of sex education in the U.S. is reviwed. In the late 1800s and early 1900s the activities of Dr. Prince A. Morrow set the stage for the 1st organized efforts which might support formal sex education programs. By the outbreak of World War I sufficient groundwork...
This paper introduces an improved and simplified method to design electromagnetic interference (EMI) filters for both dc-dc and ac-dc switching power suppl... S Ye,W Eberle,YF Liu - 《IEEE Transactions on Power Electronics Pe》 被引量: 0发表: 2004年 EMI filter and method of designing the...
A 4-year-old child with a small penis and small firm testes was found to have XXY/XXXY/XXXXY mosaicism. His growth and development were normal except for delayed speech. Intelligence quotient at 4 years of age was normal. Since Klinefelt... ...
热点论文(Hot Paper): 在SCI、SSCI过去两年发表的论文(仅限Article和Review)中,最近两个月期间同一ESI学科论文的被引次数(限SCIE, SSCI & AHCI中的索引期刊的引文,不限类型)由高到低进行排序,排在前0.1%的论文。 本期主要为大家介绍发表于2021-...
1、高被引论文(Highly Cited Paper):指对同一年内,同一个ESI学科发表的论文根据被引用次数由高到低进行排序,统计近10年,某一ESI学科被引次数排在前1% 的论文。高被引论文可帮助锁定某一学科领域中的突破性研究,并在WOS核心合集数据库中...
摘要: 随着新课程改革的不断深入,小学语篇教学作为能全面发展学生综合运用语言能力的教学途径,优势日益凸显.本文以闽教版五年级上册Unit5 Months of the Year Part B为例进行分析,谈谈如何通过激发—突破—生成—提升,加强小学英语语篇教学,激发学生学习英语的积极性,提升小学英语课堂教学效率.关键词:...
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Mosaicism 45X/47XXX is a sporadic form of ovarian dysgenesis. Many of the cases previously described were characterized by a variable phenotype expression. We here report the case of a 33-yr-old woman with recent secondary amen-orrhea, weight loss and breast regression. Her menarche had occurre...