题目内容

Natural science is a science that takes natural phenomena as the research object, studies and expounds various natural phenomena and their movement laws. Is this correct?

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Social science is a science that takes human society as its research object. Is this statement correct?

Humanities is a science that takes the human spiritual world and its precipitated spiritual culture as its object. Is this statement correct?

两个无理数相乘之积是无理数。

两个复数相加是按照平行四边形法则做加法。