A不是C。
A是周延的，C是周延的。
例如以下的句子：
松树不是阔叶树。
白马是黑马。
张三不是好人。
指标股不是刚上市的股票。
全称否定的语气也具有坚定的态度，只是全称否定的语句对于人们的行动而言，很少留下可供采取行动的指导作用。
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