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作为一种机会性感染,急性坏死溃疡性龈炎最重要的发病因素是()

单选题
2021-09-01 19:47
A、吸烟
B、心身因素
C、存在慢性牙龈炎和牙周炎
D、机体免疫功能低下
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正确答案
C

试题解析

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