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煤气管道为何装有填料函式补偿器？
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女患者，已婚5年，月经正常，婚后曾流产3次，无慢性病史，近两年想生育但一直未孕，体查未见异常，妇查见右侧输卵管呈条索状变硬，有压痛，该患者不孕的原因首先考虑为（）
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电缆应按哪些要求进行敷设？
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门未经许可离开关闭和锁闭位置故障“ERROR”LED灯闪烁（）。
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一般常用发动机的工作状态有（）.
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以下不属于信息的是（）。
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PPD阴性见于下列哪种疾病（）
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商务快线业务话机预缴分为（）
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锌酸盐镀锌工艺中，阳极容易发生钝化，造成槽电压升高及镀液不稳定等现象，阳极钝化的原因可能是（）。
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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14处填上正确答案（）