【多选题】变压器差动保护在外部短路暂态过程中产生不平衡电流(两侧二次电流的幅值和相位已完全补偿)的主要原因有()。
A.
外部短路电流倍数太大,两侧TA饱和程度不一致
B.
外部短路非周期分量电流造成两侧TA饱和程度不同
D.
TA设计选型不当,应用TP型于500KV、但中低压侧用5P或10P
E.
各侧均用TP型TA、但TA的短路电流最大倍数和容量不足够大
【多选题】关于气管内插管下列叙述正确的是
A.
为减轻插管时的应激反应,在插管前可静注利多卡因或扩血管药
B.
置人喉镜行气管内插管或套囊冲气时可能并发一过性的高血压
C.
用直喉镜片插管比弯喉镜片引起的插管应激反应为轻
D.
插管反应对正常循环功能的病人影响轻微,不应为减轻此反应而加深麻醉
E.
对冠状动脉硬化病人.瓣膜疾病或颅内压增高病人,宜预先用药物处理以减轻置喉镜时的反应
【单选题】下列关于气管内插管的叙述,正确的是
B.
出现正常的PETCO 2 波形是气管导管位于气管内的可靠指标
E.
插管前应调整体位,头后仰,使口、咽、喉在一条轴线上
【简答题】Lang Lang is a world-class young pianist who grew up in Shenyang. He went to a piano school in Beijing when he was just eight. “You need _ _21__ ,” his father said. “But if you don’t work hard, no for...
【简答题】Lang Lang is a world-class young pianist who grew up in Shenyang. He went to a piano school in Beijing when he was just eight. “You need fortune(运气), ” his father said. “But you work hard, no fortune ...
【简答题】变压器差动保护在外部短路暂态过程中产生不平衡电流(两侧二次电流的幅值和相位已完全补偿)的主要原因有哪些(要求答出5种原因)?
【简答题】Lang Lang is a world-class young pianist who grew up in Shenyang. He went to a piano school in Beijing when he was just eight. “You need luck,” his father said. “But if you don’t work hard, no fortune...
【简答题】Lang Lang is a world-class young pianist who grew up in Shenyang. He went to a piano school in Beijing when he was just eight. “You need ,” his father said. “But if you don’t work hard, no fortune wil...
【简答题】Lang Lang is a world-class young pianist who grew up in Shenyang. He went to a piano school in Beijing when he was just eight, 'You need fortune(运气),' his father said. 'But you work hard, no fortune w...
【单选题】下列关于气管内插管的叙述,正确的是
B.
出现正常的 PETCO2波形是气管导管位于气管内的可靠指标
E.
插管前应调整体位,头后仰,使口、咽、喉在一条轴线上