单项选择题
A.90% B.80% C.70% D.60%
A.60%,70% B.70%,80% C.80%,90% D.90%,90%
A.2-5 B.5-10 C.10-15 D.15-20
A.1:1:1 B.1:1:2 C.2:1:2 D.2:2:1
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