4个月婴儿,咳嗽伴喘息3天,有低热,曾肌注青霉素无效而收住院。体格检查:烦躁,三凹征(+),呼气时间延长,呼吸80次/分,心率180次/分,双肺哮鸣音为主,少量中细湿啰音,肝脏右肋下3cm,最可能的诊断是()
A. 上呼吸道感染
B. 支气管炎
C. 毛细支气管炎
D. 支气管哮喘
E. 支气管肺炎
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患者男性,25岁,因“左上3慢性根尖周脓肿,行根管充填2天,肿痛”来诊。口腔检查:唇侧黏膜红肿。X线片:左上3根尖周骨质破坏区内有大量超填物。根尖倒预备完成后,进行根尖倒充填,最佳倒充填材料应选择()
A. 玻璃离子水门汀
B. 银汞合金
C. 三氧化矿物盐聚合物(MT
D. 复合树脂
E. 氧化锌丁香油糊剂
刘先生不幸遭遇工伤事故,但是单位推脱责任不帮其申请工伤认定。这种情形刘先生可以自己申请工伤认定?必须在什么时间内申请?
Two Company switches are connected via a trunk link. In this network, the original frame is encapsulated and an additional header is added before the frame is carried over a trunk link. At the receiving end, the header is removed and the frame is forwarded to the assigned VLAN. This describes which technology?()
A. DISL
B. ISL
C. DTP
D. IEEE 802.1Q
E. MPLS
F. None of the other alternatives apply