单项选择题
女，45岁。右上第一磨牙牙周反复肿痛来诊，初诊为：慢性牙周炎。X线片显示：环绕右上第一磨牙牙根的白色阻射线消失。这表明组织有破坏的是( )
- A．牙本质
B．牙骨质
C．牙周膜
D．牙槽骨
E．牙龈组织
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相关考题
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Which of the following is NOT given as a feature of the old French way of life
A．Leisure.
B．Elegance.
C．Efficiency.
D．Taste. -
单项选择题
Which of the following best states the main idea of the passage
A．Changes in the French way of life.
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Which of the following is NOT true about Frenchmen
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C．They are more concerned with money than before.
D．They axe more competitive than the older generation.
