题目内容

Listen to a dialogue and decode the message by finding out the correct choices in brackets according to what you have heard.[音频]Chen is invited to George’s party. And she has brought along a freshly 1(made, take, baked) cake with her. George is her friend from 2(Africa, Australia, America) . He is very happy when Chen tells him that she wouldn’t miss the party for the 3 (word, world, award) . He takes this as a (an) 4 (accomplishment, complement, compliment) . After they greet each other, George tries to introduce Chen to his friends. But Chen doesn’t want to 5 (introduce, interrupt, influence) others, since all of them seem to be enjoying themselves. So George stops talking and asks Chen to 6 (drink, dance, rest) with him. But Chen says she needs to have some wine to get in the 7 (wood, mood, food) first.

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有一单相桥式整流电容滤波电路,若变压器二次电压为10V,直流负载电阻为10Ω,测得输出电压为

A. 4.5V
B. 9V
C. 12V
D. 14.1V

5.一个直流稳压电源的基本组成部分必须包括 环节、环节 环节和 环节四大部分。

为表示关系x>=y>=z,应使用C语言表达式:

A. (y<=x)&&(y>=z)
B. (x>=y)AND(y>=z)
C. (x>=y>=z)
D. (x>=y)&(y>=z)

若x=3,y=z=4,则下列表达式的值为:z>=y&&y>=x

A. 无解
B. 10
C. 0
D. 1

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