等体积的NaCl、MgCl2、AlCl3三种溶液分别与等体积等物质和量浓度的Ag

题型:选择题

问题:

等体积的NaCl、MgCl2、AlCl3三种溶液分别与等体积等物质和量浓度的AgNO3溶液恰好完全反应,则NaCl、MgCl2、AlCl3三种溶液的物质的量浓度之比是

A.1:2:3

B.3:2:1

C.6:3:2

D.1:1:1

考点:物质的量
题型:选择题

内地企业在中国香港发行股票,其公司治理要求:审核委员会成员须有至少( )名成员,并必须全部是非执行董事。

A.1

B.3

C.5

D.7

题型:选择题

应用肽疫苗或T细胞疫苗的理论依据是

A.不同HLA分子可选择性地与结合具有不同锚定位的锚定残基

B.同一HLA可结合多种抗原肽

C.同一家族的不同成员可识别和结合相同的锚定残基

D.一种HLA等位基因产物只能识别一种抗原肽

E.以上均错

题型:选择题

Although there are many skillful Braille readers, thousands of other blind people find it difficult to learn that system. They are thereby shut (1) from the world of books and newspapers, having to (2) on friends to read aloud to them.

A young scientist named Raymond Kurzweil has now designed a computer which is a major (3) in providing aid to the (4) .His machine, Cyclops, has a camera that (5) any page, interprets the print into sounds, and then delivers them orally in a robot-like (6) through a speaker. By pressing the appropriate buttons (7) Cyclops’s keyboard, a blind person can "read" any (8) document in the English language.

This remarkable invention represents a tremendous (9) forward in the education of the handicapped. At present, Cyclops costs $ 50,000. (10) , Mr. Kurzweil and his associates are preparing a smaller (11) improved version that will sell (12) less than half that price. Within a few years, Kurzweil (13) the price range will be low enough for every school and library to (14) one. Michael Hingson, Director of the National Federation for the Blind, hopes that (15) will be able to buy home (16) of Cyclops for the price of a good television set.

Mr. Hingson’s organization purchased five machines and is now testing them in Maryland, Colorado, Iowa, California, and New York. Blind people have been (17) in those tests, making lots of (18) suggestions to the engineers who helped to produce Cyclops.

"This is the first time that blind people have ever done individual studies (19) a product was put on the market," Hingson said. "Most manufacturers believed that having the blind help the blind was like telling disabled people to teach other disabled people. In that (20) , the manufacturers have been the blind ones.

6()

A.behavior

B.expression

C.movement

D.voice

题型:选择题

已知油浆外甩2吨/时,油浆回炼5吨/时,回炼油6吨/时,总进料共100吨,试计算回炼比?

题型:选择题

“同光十三绝”是指光绪年间画师沈容圃所画的十三位京昆艺人。他们是:()。

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