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【单选题】
已知P： x＞a y＞b ，Q： x+y＞a+b (x-a)(y-b)＞0 ，则（ ）A.
若P成立，则Q成立
B.
若Q成立，则P成立
C.
P与Q等价
D.
P是否成立与Q无关系
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皮皮学刷刷变学霸
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B.
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C.
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D.
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