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当前学科：异常分娩
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初孕妇，妊娠40周，宫口开全1小时30分尚未分娩。查：先露S-2，有产瘤形成，约3cm直径大小，胎方位LOT，胎膜破裂，羊水清，胎心140次／分，估计胎儿体重3500g，下列哪项处理为宜（）
A . 等待阴道自然分娩
B . 产钳助产
C . 行剖宫产术
D . 静脉滴注催产素
E . 徒手转胎位后自然分娩
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Most people have no idea of the hard work and worry that gointothe collecting of those fascinating birds and animals that they pay to see in the zoo.One of the questions that is always asked of me is 1 I became an animal collector in the first 2.The answer is that I have always been interested in animals and zoos.According to my parents, the first word I was able to say with any 3 was not the conventional “mamma” or “daddy”,4 the word “zoo”, which I would 5 over and over again with a shrill 6 until someone, ingroupsto 7 me up, would take me to the zoo.When I 8 a little older, we lived in Greece and I had a great 9 of pets, ranging from owls to seahorses, and I spent all my spare time 10 the countryside in search of fresh specimens to 11 to my collection of pets.12 on I went for a year to the City Zoo, as a student 13 , to get experience of the large animals, such as lions, bears, bison and ostriches,14 were not easy to keep at home.When I left, I 15 had enough money of my own to be able to 16 my first trip and I have been going 17 ever since then.Though a collector's job is not an easy one and is full of 18 ,it is certainly a job which will appeal 19 all those who love animals and 20. 请在4处填上正确答案（）
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群钻是由麻花钻头经过刃磨改进出来的一种先进钻头。
获取教育信息可以通过下列哪些途径（）。