题目内容

(Para. 4) 3 What was the ready solution provided by magazines in order for us to catch up with the Joneses?The ready solution was to buy products that were in the form of a___________.

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(Para. 9) 4 Where do true happiness and joy come from, if they are not anything money can buy?True happiness and joy come from w___________.

(Para. 10) 5 What are we supposed to do to stop keeping up with the Joneses?Instead of b1the message that we’re not good enough, we should have positive self-regard. We should realize we don’t have to buy things to i2others.

作简谐运动的物体，哪个物理量是不变的

A. 幅度
B. 相位
C. 频率
D. 速度

时间t=1s时，x=2cos(5t+1)与y=3cos(7t+2)的相位差等于