§9-1 压杆稳定的概念 (The basic concepts of columns) §9-3 其它支座条件下细长压杆的临界压力 (Euler’s Formula for other end conditions ) §9-2 两端铰支细长压杆的临界压力 (The Critical Load for a straight, uniform, axially loaded, pin-ended columns) §9-4 欧拉公式的应用范围•经验公式 (Applicable range for Euler’s formula • the experimental formula ) §9-5 压杆的稳定校核 (Check the stability of columns) §9-6 提高压杆稳定性的措施 (The measures to enhance the columns stability)

7-1应力状态概述 (Concepts of stress-state) 7-2平面应力状态分析-解析法 (Analysis of plane stress-state) 7-3平面应力状态分析-图解法 (Analysis of plane stress-state) 7-4三向应力状态分析 7-5平面应变状态分析 (Analysis of plane strain-state) 7-6广义胡克定律 (Generalized Hook's law) 7-7复杂应力状态的变形比能 (Strain-energy density in general stress-state 7-8强度理论(Failure criteria) 7-9莫尔强度理论 (Mohr's failure criterion)

Ⅱ. Listening skills Understanding Times and dates w: Oh, look at the clock It's 5: 15. I'll be late for Jennifer's birthday party! I was supposed to leave at 5 o'clock M: Don't worry! You still have some time. The clock is twenty minutes fast Q What time is it now?

1.H2S和CO2组成的气体混合物中,H2S的摩尔分数为0.513。将 1750cm3(在21℃,101.325kPa下测得的)混合气体通入350℃的管 式炉,然后迅速冷却。使流出来的气体通过盛有无水氯化钙的管子,结 果管子的质量增加了34.7mg。试求350℃时反应 HS(g)+CO, (g)=COS(8)+H,o(g) 的标准平衡常数。设气体服从理想气体状态方程

3.1导数的概念 一引例 1变速直线运动的瞬时速度 匀速直线运动的(瞬时)速度 设作变速直线运动的质点P(运动轨迹为s=s(t)从to

利用正交实验设计配制由透明质酸HA、Lα-DPPC磷脂和y-球蛋白3种成分构成的复合人工滑液,在PVA-H/PVA-H,PVA-H/316L S S两类人工关节摩擦副上,利用自制振子式摩擦仪测定其摩擦学参数,初步确定出复合人工滑液中3种成分的适宜配比

Economic growth‖ Is there some action a government of India could take that would lead the Indian economy to grow like Indonesia's or Egypt's? If so, what, exactly? If not, what is it about the \nature of India that makes it so? The conse- quences for human welfare involved in questions like these are simply stag- gering: Once one starts to think about them, it is hard to think about Robert E. Lucas, Jr

1范围 本方法适用于地面水、饮用水、污水、电子电镀、生化等一般工业废水中NO3N的测 定。 本方法的检出限为0.21mg/LNO3-N。线性测量范围为1.00~1000mg/lno3-n 试验了sO2、pO4、Cr、Br、I、Ac、HCO3、CO32、C2O42、nO2、s2、+、nH4、 A13+、Ca2+、Mg2+、Zn2+、Cu2+、Pb2、Fe2+、Fe+对测定的干扰,其中s2、r明显干扰,Br 大于57倍,NO2大于32倍,C大于250倍时有干扰,其他均无干扰

1范围 本方法适用于地面水、饮用水、生活污水及一般工业废水中C含量的测定。检出限为 0.9mg/L,线性范围是9.0~1000mg/L Br、s2对本法有明显干扰,超过0.36倍时干扰测定。K+、Na、Cu2+、Zn2+、Ca2+、Mg2+、 Pb2+、Fe3+、AP+、NH4+、Ac、HCO3均不干扰测定。其中s2的干扰可用加入少量的硝酸铅消 除。Br、的干扰可从测得的总卤素离子的含量中扣除Br、含量的方法消除

1、三角形相图的结构、用途:顶点、边、相点的意义、杠杆原理、和点、差点、 2、单级萃取:流程、计算B与S部分互溶时:图解法B与S完全不互溶时:图解法、解析法 3、多级萃取:多级错流:图解法多级逆流:图解法,解析法流程、特点、图解求级数N当平衡线为直线时