<正> Much attention has been paid to the studies on the amine-peroxide redox system. Recently, some works have been published concerning vinyl polymerization in
急性肾功能衰竭(ARF)是内科、外科和妇产科常见的严重病症。近年来随着对ARF病理生理和发病机制的深入研究,以及血液净化技术的正确应用,使ARF的治愈率有所提高,为了进一步
<正> A number of fluorescent retrograde neuronal tracers have been introduced recently. However, they all have some shortcomings. We have found that a home-made
<正> Through reductive addition of pheny llithium to μ—S2Fe2 （CO）6 and nucleophilic substitution between alkyl halides and （μ—PhS） （μ-LiS）Fe2·（CO）6, we have s
随着高考科目设置的改革 ,自２００２年起 ,全国绝大多数省区已采取语文、数学、外语三门加综合测试的“３ +综合”的高考模式。那么 ,仍以“３ +１”模式为主的上海高考历史卷 ,如何在特殊
在数学竞赛试题中,都有应用最小公倍数来解决相遇问题和余数相关的总数问题,现笔者略举几例加以说明. 一、与余数相关的问题
In the math contest questions, the least co
前列腺联合部切开治疗前列腺增生症张英杰，袁九银，王栋，窦启锋，常连胜，秦维康近年来前列腺增生症（ｂｅｎｉｇｎｐｒｏｓｔａｔｉｃｈｙｐｅｒｔｒｏｐｈｙ，ＢＰＨ）的治疗方法较多，其共同的目的是改善患者排尿障碍。１９８６年Ｓｈａｆｉｋ［１］首先报告应用前列...
Prostat
<正> The multi-hologram method is the basic method for holographic measurement of multi-dimensional (2-D or 3-D) displacement. Some single-hologram methods for
问题如图1,在△ABC 中,∠BAC= 45°,AD⊥BC于 D,BD=3,DC=2,求AD. 本题虽小,但题目条件简洁明了,且问题内涵丰富,因此细细咀嚼,思路广,趣味浓,值得探究.下面从五个方面予以说
例直线l:y=-1/2x+2与椭圆(x2)/(a2)+(y2)/(b2)=1交于A、B两点,O为坐标原点,M为线段AB的中点.若|AB|=5~(1/2),直线OM的斜率为1/2,求椭圆的方程.
The straight line l:y=-1/2