单选题:在儿童青少年各种发育年龄中,哪个发育年龄应用最广泛(  )。

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题目内容:
在儿童青少年各种发育年龄中,哪个发育年龄应用最广泛(  )。 A.实际年龄
B.形态年龄
C.第二性征年龄
D.牙齿年龄
E.骨骼年龄

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