单项选择题
A.100% B.120% C.400% D.1200%
A.1.7% B.-1.7% C.3.7% D.-3.7%
A.1.87% B.1.74% C.1.82% D.1.78%
A.-13.6% B.15.0% C.-4.5% D.4.5%
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