单项选择题
A.+1,-1 B.+3,-2 C.+2,-2 D.+4,-3
A.+1,-1 B.+3,-2 C.+4,-1 D.+3,-1
A.1435 B.1450 C.1348 D.1391
A.1435 B.1450 C.1391 D.1439
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