单项选择题
A.45% B.40% C.30% D.35% E.25%
A.5%以下 B.9%以下 C.10%~29% D.30%~49% E.50%以上
A.<9% B.10~29% C.30~49% D.50~59% E.>60%
A.9% B.(9+(12-年龄))% C.12% D.18% E.9%+年龄
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