单项选择题

Periodontal ligament space appears as a radiolucent space between the tooth root and the （）.

A．alveolar crest
B．lamina dura
C．cancellous bone
D． trabecular bone

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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

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