第6题: [单项选择]牙周炎进展期病变有下列病理变化,除了() A. 牙周袋内有大量炎性渗出物 B. 有大量新生的胶原纤维和扩张、充血的毛细血管 C. 沟内上皮充血糜烂和溃疡 D. 结合上皮向根方增殖 E. 根面暴露的牙骨质可见不同程度的吸收 参考答案:B 答案解析:在牙周炎进展期,病理表现为牙周袋内有大量炎性渗出物,沟内上皮出现糜烂或溃疡,结合上皮向根方增殖,形成深牙周袋,周围有密集的炎症细胞浸润,下方的胶原纤维破坏、丧失,牙槽骨吸收活跃。只有当牙周炎处于静止期
第24题: [单项选择]Questions 11 to 18 are based on the conversation you have just heard. A. Not getting what he wants. B. A custom that is new to him. C. Calling up customers. D. Some of his good friends. 参考答案:B 答案解析:[听力原文] M: I wish I could get used to this American custom of using first names. W: I usually c
第25题: [单项选择]()属于热辐射电光源。 A. 金属卤化物灯 B. 卤钨灯 C. 高压水银灯 D. 日光灯 参考答案:B