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以下何种疾病可行脾切除术（）
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关于窦房结的描述正确的是（）
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苏曼殊爱情小说的认识价值和审美价值体现在哪些方面？
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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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根据煤气柜油槽油位判断煤气柜活塞倾斜度，活塞倾斜度（）。
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钾、钠着火不能用（）扑救。
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肝门静脉
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何为数字化定制生产？
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以下哪项不是高压发生器的安全回路（）
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血管内皮细胞产生（）