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【单选题】
关于根尖周炎特点哪答案:正确的
A.
根尖有丰富的血管网和侧支循环，炎症时易于清除产物
B.
根尖没有牙本质包绕，所以急性炎症时疼痛不明显
C.
牙周膜内有本体感受神经末梢，但由于受炎症的影响不易定位患牙
D.
根尖组织的淋巴循环比较单一，炎症时可引起固定的淋巴结肿大
E.
B+D
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