Easterlin's paper showed that there was no real correlation between a developed contry's income level and it's citizens' hapiness.
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Television and Internet lead to the isolation of people from the real world.
A. 对
B. 错
Our little devices not only change what we do, they also change who we are.
A. 对
B. 错
职业道德对企业起到的作用包括:
A. 决定经济效益
B. 促进决策科学化
C. 增强竞争力
D. 树立员工守业意识
热继电器过载时双金属片弯曲是由于双金属片的（）不同。
A. 机械强度
B. 热膨胀系数
C. 温差效应
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