第10题: [简答题]What is the PMTUD for̳4;IPv6 network? 参考答案:
PMTUD is using to finding out the lowest MTU value along a path when a packet is sent to a destination to avoid fragmentation. PMTUD for IPv6 uses ICMPv6 error message Type 2, Packet Too Big, for its operation.
Fragmentation in IPv6 is not performed by intermediary routers. The source node may fragment packets by itself only when the path MTU is smaller than the packets to deliver.
第25题: [单项选择]急性乳腺炎形成脓肿后行切开引流时,错误的是 A. 除乳晕下脓肿外,切口应做放射状 B. 切口应引流通畅,较大时可作对口引流 C. 不要分离脓肿隔膜,以防炎症扩散 D. 乳房后脓肿可做乳房下缘弧形切口 参考答案:C 答案解析:[考点] 急性乳腺炎的手术治疗原则
[分析] 急性乳腺炎脓肿形成后需做切开引流时,为避免损伤乳管,应做放射状切开,乳晕下脓肿应沿乳晕边缘做弧形切口,深部脓肿或乳房后脓肿可沿乳房下缘做弧形切口;脓肿