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下述叙述正确的是（）。
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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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焊接结构件在什么情况下需要焊后热处理？依据是什么？
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钢坯的出炉温度应该保证（）。
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人们往往根据（）来衡量、评价领导者的素质修养。
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疑似细胞免疫缺陷的患者，应做下列中的（）
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永久性密闭的掏槽深度不小于（）mm。
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共代谢
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计算题：已知钢筋的密度是7.85t/m3，泥浆的密度是1.2t/m3，钢筋笼的质量为15.7t，当钢筋笼全部沉没在泥浆中时所受的浮托力是多少？
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心搏骤停一旦确诊，应立即采取（）