单项选择题
A.前弹力层 B.后弹力层 C.实质层 D.内皮细胞层 E.上皮细胞层
A.10mm B.13mm C.11mm D.12mm E.14mm
A.11~12mm B.11~13mm C.11~14mm D.12~14mm E.12~13mm