可以设计成混悬剂的药物有：A．要求的剂量在给定的溶剂体积内不能全部溶解的难溶性药物

已知集合A到B的映射f: x→y=2x+1，那么集合A中元素2在B中对应的元素是：[ ]

A、2            

B、5          

C、6            

D、8

空冷风机冷空气的流速及风量依靠改变电机的（）来实现。

省、自治区、直辖市的区域划分由全国人大常委会批准。 ( )

用万用表测量电阻时，为了保证数据测量的准确度，需要先对万用表进行（）。

In every cultivated language there are two great classes of words which, taken together, comprises 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) in a style appropriately elevated above the habitual (19) of 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.

20（）

A.diversion

B.distinction

C.diversity

D.similarity