单项选择题
A.-1.25DSB.+1.25DSC.+1.50DSD.-1.50DS
A.-1.50DSB.+1.50DSC.+1.75DSD.-1.75DS
A.-1.50DSB.+1.50DSC.+1.00DSD.-1.00DS
A.+1.75DSB.+1.50DSC.+1.25DSD.+1.00DS
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