明朝有学者言:“惟夫国之有是,出于群心之自然……匹夫匹妇之所是,主与臣不得矫之以为非;匹夫匹妇之所非,主与臣不得矫之以为是。”以上言论( )
—We all went to the park except you last weekend. Why didn't you come?
—Because I the park twice.
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若△ABC的三边a,b,c,它的面积为a2+b2-c243,则角C等于( )
已知:CuCl2溶液与乙二胺(H2N﹣CH2﹣CH2﹣NH2)可形成配离子Cu(En)22+ (En是乙二胺的简写):
请回答下列问题: