单项选择题
A.15 B.10 C.8 D.5
A.4 B.6 C.12 D.24
A.1/100~3/100 B.1/10~3/10 C.1/1000~3/1000 D.2/1000~3/1000
A.50% B.75% C.25% D.90%
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