单项选择题
A.16cmB.10cmC.18cmD.20cm
A.4~5cmB.2~3cmC.5~6cmD.7~8cm
A.14~16cmB.10~12cmC.16~18cmD.20~25cm
A.0.3cmB.0.5cmC.0.4cmD.0.1cm
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