A.5%~10% B.10%~15% C.55%~65% D.20%~40% E.20%~30%

admin2009-04-17  5

问题 A.5%~10%
B.10%~15%
C.55%~65%
D.20%~40%
E.20%~30%

选项 A、 
B、 
C、 
D、 
E、 

答案C

解析
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