A.20%. B.15.0%. C.12.0%. D.9.0%. E.5.0%.

admin2009-04-16  9

问题 A.20%.
B.15.0%.
C.12.0%.
D.9.0%.
E.5.0%.

选项 A、 
B、 
C、 
D、 
E、 

答案B

解析
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