报纸不能用来包装食品,除因可能带有病菌外,还因为报纸上带有什么元素
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I have devoted four weekends to
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When one looks back upon the fifteen hundred years
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Smoking, which may be a pleasure for some
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已知数列{an}满足a1=1 an+1=2an+1(n∈N*)
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