单项选择题
Which is Confucius’s theory of human nature?
A．humans are born with the same natureB．humans are born evil
C．humans are born good
D．humans are born good or evil
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m/s的匀速率圆周运动。在1s的时间内质点的速率的变化量大小为______m/s。（保留三位有效数字）
单项选择题
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