单项选择题
A.4岁 B.8岁 C.10岁 D.12岁 E.18岁
A.11mm B.12mm C.13mm D.14mm E.15mm
A.10mm B.11mm C.12mm D.13mm E.15mm
A.10mm B.11mm C.12mm D.13mm E.14mm
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