单项选择题
A.10%-20% B.20%-40% C.40%-50%
A.85% B.1/2~1/3 C.90%
A.0.15~0.30 B.0.30~0.40 C.0.10~0.20
A.0.7-0.92 B.0.5-0.92 C.0.5-0.7
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