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杂食性
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中心静脉穿刺时，若病人无任何相对禁忌症，临床一般首选穿刺位置是（）
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单稳态触发器需要有固定的（）和一定幅度的（）驱动才能工作。
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佛教教义中的（）认为，只有要求信徒把心放在无常、无我、苦之上，才可以勇猛向道。
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立式横水管锅炉最易发生腐蚀的受压部件是（）
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治疗伴高钾血症及药物性心律失常的酸中毒，应首选的药物是（）
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在以下结算方式中，安全性最差的是()
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横结肠癌的扩散途径可以是（）。
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下面有关玻璃体液化的有()
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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（）