单项选择题
A.2.63 B.1.8 C.1.4 D.2.2
A.2.63 B.2.5 C.2.4 D.2.2
A.20.6 B.14.4 C.15.6 D.16.5
A.15%-75% B.25%-75% C.35%-75% D.45%-75%
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