单项选择题
A.15~17cmB.12~13cmC.18~20cmD.20~22cm
A.1.5cmB.2cmC.2.5cmD.3.5cm
A.43.5%B.50%C.40.5%D.55.5%
A.2.5cmB.3cmC.1.5cmD.4cm
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