A. B. C. D.
A.7.5%×9.5%×6.2%×4.9% B.(7.5%×9.5%×6.2%×4.9%)-100% C.(107.5%×109.5%×106.2%×104.9%)-100% D.107.5%×109.5%×106.2%×104.9%
A.提高 B.降低 C.不變 D.不能作結(jié)論