More environment-friendly methods Natural insect attractants — instead pesticide Less reactive compounds organic refrigerants and aerosol propellant — instead Freon (that destroy the Earth’s ozone layer) Cars with more efficient combustion engines — reduce the massive amount of automobile

1.12A The Structure of Methane sp3 Hybridization The 4 sp3 orbitals should be oriented at angles of 109.5° with respect to each other. An sp3-Hybridized carbon gives a tetrahedral structure for methane, and with four equivalent C—H bonds

1858 ~ 1861, Kekulé, Couper, and Butlerov, laid the basis for one of the most fundamental theories in chemistry: the structural theory. Valence（化合价）: C — tetravalent; O — divalent; H — monovalent

一、掌握支出法计算国民收入的基本方法 二、掌握收入法计算国民收入的基本方法 三、掌握增值法计算国民收入的基本方法

一、 课程校内发展的主要历史沿革 内科学是一门古老而又不断发展的学科，她的古老在于她的历史源远流长， 内科学作为临床医学中的一门综合学科涉及面广，整体性强，是临床医学中各 科的基础，一直以来都是医学专业的主修课程。从 1936 年建校后，临床医生就 将自己的学识和经验传授给学生，从可以考证的资料来看，中山医院的林兆耆 教授 1952 年编写出版了《实用内科学》，是我国第一部大型的内科综合性参考 书，再版多次，深受欢迎

Esters, like aldehydes and ketones, are weakly acidic. When an ester with an alpha hydrogen is treated with one equivalent of a base such as sodium ethoxide, a reversible condensation reaction occurs to yield a β−keto ester product. This reaction between two ester components is known as the Claisen condensation reaction

Carboxylic acids are just one member of a class of acyl derivatives, RCOY, where the acyl group is bonded to an electronegatives substituent -Y that can act as a leaving group in substitution reactions. Numerous acyl derivatives are possible, but we’ll be concerned only with four of the more common ones, in addition to carboxylic acids themselves: acid halides, acid anhydrides, esters, and amides

群体沟通的优缺点 组织和参加会议 会议沟通模式 明确会议目的 确定与会者构成 明确与会者角色职责 会议的组织准备工作 会议议程 会议记录

1．肾脏的功能单位为： Ａ．肾单位 Ｂ．肾小球 Ｃ．肾皮髓质 Ｄ．肾小囊 Ｅ．肾小球旁器 2．正常情况下，肾小球滤过液（原尿）在肾小管中被吸收的占总量 Ａ．10％ Ｂ．30％ Ｃ．50％ Ｄ．80％ Ｅ．99％

A1 题型（2211~2327） 2211.下列哪项试验可以帮助诊断下丘脑功能紊乱？（中，理解） A.TSH 兴奋试验 B.胰岛素耐量试验 C.钠-钾平衡试验 D.可乐宁试验