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【单选题】
关于釉质生长线，下列叙述哪项错误
A.
釉质横断磨片，生长线呈褐色同心圆层状排列
B.
釉质纵断磨片，生长线从釉质牙本质界向外在牙尖部呈环形排列
C.
釉质生长线是由于釉质周期性生长速率改变所形成的间歇
D.
釉质生长线代表15～20天釉质沉积的厚度
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