单项选择题
A.9% B.10% C.11% D.12% E.13%
A.1cm×1cm B.3cm×3cm C.5cm×5cm D.7cm×7cm E.9cm×9cm
A.24 B.36 C.48 D.72 E.96
A.5% B.10% C.1s% D.20% E.25%
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