这位古希腊哲学家似乎能用简单的文字表达复杂的思想。
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测定某样品的含氮量，6次平行测定的结果分别是20.48%、20.55%、20.58%、20.60%、20.53%、20.50%。（1）计算这组数据的平均值、平均偏差、标准偏差；（2）若此样品是标准样品，氮的质量分数为20.45%，计算第一个结果的绝对误差和相对误差。
According to the passage, literature, music and the arts（）
A. do not contribute to economic growth at all
B. are less useful to the society because they do not make direct contribution to economic growth
C. are similar to medical and social services in their way of promoting economic growth
D. should develop only when they are good for economic growth
70（）
A. back
B. away
C. out
D. along
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