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题目：
未知类型
A.包过滤技术
B.应用级网关技术
C.代理服务器技术
D.NAT技术
答案：
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井下三器
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线性规划问题的一般模型中一定有不等式约束。()
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土三七功效与作用
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肥厚型梗阻型心脏病，可使杂音减轻的是（）
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一般认为，酒精性肝硬化摄入乙醇量至少要达到（）
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国际集装箱的标准有（）英尺。
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离子交换树脂如何转型？
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男，64岁，近日有呼吸困难、咳嗽、下肢水肿。查体：呼吸急促，不能平卧，精神焦虑，该患者的体位可能是（）。
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In every cultivated language, there are two great classes of words which, taken together, comprise the whole vocabulary. First, there are those words（1）which we become acquainted in daily conversation, which we（2）,that is to say, from the（3） of our own family and from our familiar associates, and（4） we should know and use （5 ）we could not read or write. They （6） the common things of life, and are the stock in trade of all who （7） the language. Such words may be called“popular”, since they belong to the people （8） and are not the exclusive （9） of a limited class. On the other hand, our language （10） a multitude of words which are comparatively （11） used in ordinary conversation. Their meanings are known to every educated person, but there is little （12） to use them at home or in the market-place. Our （13） acquaintance with them comes not from our mother's （14） or from the talk of our school-mates, （15） from books that we read, lectures that we （16） ,or the more （17）conversation of highly educated speakers who are discussing some particular （18） n a style appropriately elevated above the habitual（19） f everyday life. Such words are called“learned”, and the （20） between them and the“popular”words is of great importance to a right understanding of linguistic process. 请在15处填上正确答案（）
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贺绿汀的（）的问世，标志着中国钢琴音乐创作已经进入一个新的历史时期，也是近代中国钢琴音乐最杰出的作品.