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 and the question will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A),B),C)and D),and decide which is the best answer. Then mark the corresponding letter on the Answer Sheet with a single line through the center

I. Choose the Correct Answer 1. Which of the following quantities are independent of the choice of inertial frame? (There may be more than one correct answer) (A)Velocity (B)Acceleration (C)Force (D)Work Solution: In all the inertial frame, the forces acted on a body are same,=ma=F'=ma', therefore the force and acceleration are independent of the choice of inertial frame

I If f(t)=100 for 04.(a) Calculate v at t=T/4.(b) Find the average power delivered by this waveform to a 5Q2 resistor 3 Let v(t)=3-3 cos(100 t-40)+4 sin(200 T t-10)+2.5 cos 300 tt V Find: (a)the average value Var;(b)the rms value V;(c)the period T; (d)v(18ms)

SOLUTIONS TO TEXT PROBLEMS 24.(b) A benzyl group(C., CH2) is ortho to the phenolic hydroxyl group in o-benzylphenol. OH CH2C.Hs (c)Naphthalene is numbered as shown. 3-Nitro-I-naphth has a hydroxyl group at C-1 and a nitro group

一、例题精解 【例题3.1】在R、L、C元件串联的电路中,已知R=30,L=127mh,c=40uF, 电源电压u=2202sin(314t+20°)V.(1)求感抗、容抗和阻抗;(2)求电流的有效值1 与瞬时值i的表达式;(3)求功率因数cos;(4)求各部分电压的有效值与瞬时值的表 达式;(5)作相量图;(6)求功率P、Q和S

Simulated Test [PREVIOUS] [NEXT] Part I Structure and Vocabulary Section A Directions: Beneath each of the following sentences, there are choices marked A, B, C and)Choose the one that best completes the sentence. Mark your answer on the ANSWER SHEET by blackening the corresponding letter in the brackets. (5 points)

Simulated Test [PREVIOUS] INEXT] Part I Structure and Vocabulary Section A Directions: Beneath each of the following sentences, there are 4 choices marked A, B, C and D)Choose the one that best completes the sentence. Mark your anawer on the ANSWER SHEET by blackening the corresponding letter in the brackets. (5 point)

考研英语模拟试题[24] Part I Structure and Vocabulary Section A Directions: Beneath each of the following sentences, there are four choices marked A, B, C and D)Choose the one that best completes the sentence. Mark your answer on the ANSWER SHEET by blackening the corresponding letter in the brackets. (5 points)

考研英语模拟试题[25] Part I Structure and Vocabulary Section A Directions: Beneath each of the following sentences, there are 4 choices marked A, B, C and D)Choose the one that best completes the sentence Mark your anawer on the ANSWER SHEET by blackening the corresponding letter in the brackets. (5 point

考研英语模拟试题[28] Part I Structure and Vocabulary Section A Directions: Beneath each of the following sentences, there are four choices marked A, B, c and D. Choose the one that best completes the sentence. Mark your answer on the ANSWER SHEET.(5 points)