单项选择题
A.-4.50DSB.-4.75DSC.-4.25DSD.-8.00DS
A.-5.75DSB.-5.50DSC.-6.00DSD.+1.75DS
A.+5.25DSB.-5.25DSC.+1.50DSD.-2.25DS
A.+1.25DSB.+1.50DSC.-1.00DSD.-0.50DS
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