Uint I. Basic listening practice 1. Script M: Now we have satellite and high-powered microscope, it s easy to think we know everything about the world; but we still dont understand EI Nino W: Right. Scientists all over the world over are even uncertain about the cause of the warm Pacific current that brings storms or drought-the mysterious EI Nino

Ⅱ. Listening skills 1. M: Will you love and keep him in sickness and in health, as long as you both shall live? Q: Who is the woman 2. W: Mike, wake upl It is time to go to school. Hurry up or you're going to be late M: Dont worry. I can sleep all day Did you forget today is Martin Luther King's

Basic listening Practice 1. Script W: Let me recommend my brother to you. He's really done well in the stock market over the last M: The real question is this: How have you dine by taking his advice Q: What does the man mean?

Flying there is not half the fun I. Basic listening Practice I Script M: would you prefer a window or an aisle seat, madam? W: Aisle, please. If there's none left, then a wind. w seat is Ok. But I don't like middle seats。 Q: what is the order of the womans preference? C: aisle-wingdow-minddle

Uint I. Basic listening practice 1. Script W: Have you chosen your elective for next semester yet? Are you taking Frenc riting again? M: Yes I am, but it's compulsory for us next semester. So i think I'm gong to do marketing as an elective instead

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Chapter 30 The Wave Nature of Light, Interference 1 Huygens'principle 2 Refraction 3 Young's Double-slit Experimentinterference 4 Intensity in the Double-slit Interference Pattern 5 Interference in Thin Films 6 Michelson Interferometer

在700℃、3kg/cm2的恒压下进行下列反应 C4H10(A)→2C2H4(B)+H2(C) 反应开始时,系统中的含量为116kg, 当反应完成50%时,丁烷的分压以2.4kg/ cm2·s的速率发生变化,试求下列各项的 变化速率:(a)乙烯的分压;(b)的摩尔数; (c)丁烷的摩尔分率

1-36台直流电动机,电枢电流为154A,2P=4,单波S=27,每元件匝数Wy=3, 每极磁通量等于0025Wb,问电机的电磁转矩为多少?若同样元件数,绕组改为单迭,极 数于励磁不变,电磁转矩又为多少?

城市污水一般由生活污水和工业废水组成,城市污水的水质与城市的规模、生活水平、 工业企业的状况及废水处理水平、排水系统的形式及完善程度气候环境等因素有关。主 要水质指标为:水温一般在10~20℃,CO为200~500mg/L,BOD3为100~300mg/L, pH=6.5~7.5,S=100~250mg/L,可生化性较好,各种营养物质齐全,对一些有毒有害 工业废水必须进行预处理后才能排入城市下水道,以免对城市污水处理系统造成冲击