函数f(x)的单调性与极值是函数的重要性态如图: 曲线弧AB是单增的曲线但从A到C的曲线是向下弯 (或凸)的;从C到B的曲线是向上弯(或凹)的.显然,曲线 的弯曲方向和弯曲方向的转变点对我们研究函数的性 态是十分重要的.这就是下面讨论的凹性与拐点

连续函数是非常重要的一类函数也是函数的一种 重要的性态然界中的许多变量都是连续变化着的,即 在很短的时间内,们的变化都是很微小的这种现象反 映在函数关系上,就是函数的连续性;对函数曲线来说 就是从起点开始到终点都不间断 函数增量(改变量) 设函数y=f(x,当x从x变到x1时,自变量的改变 量(在x处的增量)记为A=xrx2.相应的函数从x 变到(x)时,其函数值之差

试题一及答案 Part I Listening Comprehension (20 minutes) Section A Directions: In this section, you will hear 10 short conversations. At the end of each conversation, question will be asked about what was said. Both the conversation and the question

Directions: In this section, you will hear 10 short conversations. At the end of each conversation, a question will be asked about what was said Both the conversation and the question will be spoken only once. After each question there will be pause. During the pause, you must read the four choices marked), B), C)and D),and

Directions: In this section, you will hear ten short conversations. At the end of each conversation, a question will be asked about what was said. both the conversation

Part IListening Comprehension (20 minutes) Directions: In this section, you will hear ten short conversations. At the end of each conversation, a question will be asked about what was said. Both the conversation

Part I Listening Comprehension (20 minutes) Directions: In this section, you will hear ten short conversations at the end of each conversation, a question will be asked about what was said. both the conversation

Part I Listening Comprehension(20 minutes) Directions: In this section, you will hear ten short conversations. At the end of each conversation, a question will be asked about what was said. both the conversation

I, Aims and Requirements 1 To review the classification of sentences 2 To let the ss know the location combination and the choice of relative pronouns and adverbs 3, To remember some typical sentences and learn by analo I、 Key points: The choice of relative pronouns and relative adverbs I、 Difficult points:

§8－1 Electric Charges Coulomb’s Law 电荷 库仑定律 §8－2 The Electric Field 电场 电场强度 §8－4 Gauss’ Law 高斯定理 §8－5 Electric Potential 静电场的功 电势 §8－3 Electric Field Line and Flux 电力线 电通量 §8－6 Equipotential Surface and Potential Gradient 等势面 电场强度与电势的关系 §8－7 The Electric Force Exerted on a Moving Particle 带电粒子在外电场中的运动