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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___________.
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(Para. 10) 5 What are we supposed to do to stop keeping up with the Joneses?Instead of b______1______the message that we’re not good enough, we should have positive self-regard. We should realize we don’t have to buy things to i______2______others.
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时间t=1s时，x=2cos(5t+1)与y=3cos(7t+2)的相位差等于
质量为1kg的钢球悬挂在劲度系数为100N/m的弹簧下作简谐振动，角频率为（IS）
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