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在WHILE后指定一个条件表达式，当指定条件不满足时，则执行（）。（FANUCK系统）
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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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PCM帧结构在国际上有两种制式，试分析、比较这两种制式的特点。
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关于小肠的描述，哪项是正确的？（）
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简述小儿约束法的注意事项。
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小儿泄泻的病因很多，其中最重要的是（）
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增升效率最好的襟翼是（）.
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常见的效果器面板上，DIGITAL（）表示数字输入/输出指示。
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下列属于社区内的资源的是()。