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题目：
未知类型
A、收益的最低可接受水平
B、单位活动的贡献
C、每周单位的活动成本
D、每种资源的可供量
答案：
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甲亢危象的表现是（）
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比较复杂的产品组合采用的较多的促销手段是()。
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水垢和水渣的形成是一个复杂的物力化学过程，这个过程分为哪几步？
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（）在法国图卢兹发表公报说，公司将在中国设立创新中心，该中心预计于2017年年底前正式投入运营。
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核细胞的基本结构体系包括以（）、（）与表达系统和有特异蛋白质装配构成的细胞骨架系统。
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（）的精度等级是用引用误差表示的。
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工程项目分标策划依据的方面有（）
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围生期
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下列不是巨噬细胞在肿瘤免疫中的作用的是（）。
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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（）