问题
单项选择题
Which one of the following anatomy is not usually apparent radiographically
A．enamel
B． dentin
C．cementum
D．pulp cavity
答案
参考答案：C
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Which one of the following anatomy is not usually apparent radiographically
A．enamel
B． dentin
C．cementum
D．pulp cavity
参考答案：C