单项选择题
A.+0.75DSB.+1.00DSC.+1.25DSD.-1.75DS
A.-2.00DSB.-4.25DSC.-2.50DSD.-4.50DS
A.-4.50DSB.-4.75DSC.-4.25DSD.-8.00DS
A.-5.75DSB.-5.50DSC.-6.00DSD.+1.75DS
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