单项选择题
A.G1 B.J1 C.K3 D.N1
A.64 B.192 C.576 D.768
A.50 B.125 C.150 D.500
A.K2(b6-b8) B.K2(b2-b10) C.K2(b5-b8) D.K2(b1-b5)
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