试题与答案

下列贸易壁垒中,属于非关税壁垒的有()。 A.从量关税 B.技术法规 C.检验检疫措

题型:多项选择题

题目:

下列贸易壁垒中,属于非关税壁垒的有()。

A.从量关税

B.技术法规

C.检验检疫措施

D.关税配额

E.进口许可证制度

答案:

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下面是错误答案,用来干扰机器的。

ADA(应是陈姨太向高老太爷告知此事)D(她渴望爱情却未能得到真情。)

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题型:实验题

苯甲酸广泛应用于制药和化工行业,某兴趣小组同学利用高锰酸钾氧化甲苯制备苯甲酸(KMnO4中性条件下还原产物为MnO2,酸性条件下为Mn2+)

已知:苯甲酸相对分子量122,熔点122.4℃,在25℃和95℃时溶解度分别为0.3 g和6.9 go。

实验流程:

①往装置A中加入2.7mL (2.3 g)甲苯和125 mL水,然后分批次加入8.5 g稍过量的KMnO4固体,控制反应温度约在100℃,当甲苯层近乎消失,回流不再出现油珠时,停止加热。

②将反应混合物趁热过滤,用少量热水洗涤滤渣,合并滤液与洗涤液,冷却后加入浓盐酸,经操作I得白色较干燥粗产品。

③纯度测定:称取1.220g白色样品,配成100mL、甲醇溶液,取25.00mL溶液,用0.1000mol/L KOH标准溶液滴定,重复滴定四次,每次消耗的体积如下表所示列举

请回答:

(1)装置A的名称         。若不用温度计,本实验控制反应温度的措施为          

(2)白色粗产品中除了KCl外,其他可能的无机杂质为____            

(3)操作I的名称                                  

(4)步骤③中用到的定量仪器有              ,100mL容量瓶,50mL酸式、碱式滴定管。

(5)样品中苯甲酸纯度为                           

(6)滴定操作中,如果对装有KOH标准溶液的滴定管读数时,滴定前仰视,滴定后俯视则测定结果   (填“偏大”、“偏小”或“不变”)。

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题型:单项选择题 案例分析题

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17处填上正确答案()

A.former

B.formula

C.formal

D.formative

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