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【单选题】
When one looks back upon the fifteen hundred years that are the life span of the English language, he should be able to notice a number of significant truths. The history of our language has always been a history of constant change--at times a slow, almost imperceptible change, at other times a violent collision between two languages. Our language has always been a living, growing organism, it has never been static. Another significant truth that emerges from such a study is that language at all times has been the possession not of one class or group but of many. At one extreme it has been the property of the common, ignorant folk, who have used it in the daily business of their living, much as they have used their animals or the kitchen pots and pans. At the other extreme it has been the treasure of those who have respected it as an instrument and a sign of civilization, and who have struggled by writing it down to give it some permanence, order, dignity, and if possible, a little beauty. As we consider our changing language, we should note here two developments that are of special and immediate importance to us. One is that since the time of the Anglo-Saxons there has been an almost complete reversal of the different devices for showing the relationship of words in a sentence. Anglo-Saxon (old English ) was a language of many inflections. Modem English has few inflections. (78) We must now depend largely on word order and function words to convey the meanings that the older language did by means of changes in the forms of words. Function words, you should understand, are words such as prepositions, conjunctions, and a few others that are used primarily to show relationships among other words. A few inflections, however, have survived. And when some word inflections come into conflict with word order, there may be trouble for the users of the language, as we shall see later when we turn our attention to such matters as WHO or WHOM and ME or I. The second fact we must consider is that as language itself changes, our attitudes toward language forms change also. The eighteenth century, for example, produced from various sources a tendency to fix the language into patterns not always set in, which grew until at the present time there is a strong tendency to restudy and re-evaluate language practices in terms of the ways in which people speak and write. In contrast to the earlier linguists, modem linguists tend to ______ .
A.
attempt to continue the standardization of the language
B.
evaluate language practices in terms of current speech rather than standards or proper patterns
C.
be more concerned about the improvement of the language than its analysis or history
D.
be more aware of the roles of the language usage
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【判断题】采用盐酸萘乙二胺分光光度法测定固定污染源排气中的氮氧化物,当臭氧浓度大于氮氧化物浓度5倍,二氧化硫浓度大于氮氧化物浓度100倍时,对氮氧化物测定有干扰。
A.
正确
B.
错误
【判断题】测定大气环境中二氧化硫的含量时,可以采用直接采样法采集样品。
A.
正确
B.
错误
【单选题】颏舌肌
A.
起于舌骨
B.
止于下颌骨体内侧面
C.
属舌骨上肌群
D.
双侧收缩使舌尖前伸
E.
一侧收缩使舌尖偏向收缩侧
【单选题】在数制的转换中,正确的叙述是
A.
对于相同的十进制整数(>1),其转换结果位数的变化趋势随着基数R的增大而减少
B.
对于相同的十进制整数(>1),其转换结果位数的变化趋势随着基数R的增大而增大
C.
不同数制的数字符是各不相同的,没有一个数字符是一样的
D.
对于同一个整数值的二进制数表示的位数一定大于十进制数字的位数
【单选题】用溶液吸收法测定大气中二氧化硫,采用的吸收剂是( ),吸收反应类型试( )
A.
氢氧化钠,中和反应
B.
四氯汞钾溶液,络合反应
C.
水,物理作用
D.
10%乙醇,物理作用
【单选题】颏舌肌
A.
单侧收缩使舌尖向同侧
B.
双侧收缩使舌尖向前伸
C.
双侧收缩使舌尖向后
D.
一颏舌肌瘫痪时,伸舌舌尖偏向健侧
E.
属舌内肌
【单选题】颏舌肌
A.
起于舌骨
B.
止于下颌骨体外侧面
C.
属舌骨上肌群
D.
双侧收缩使舌尖前伸
E.
一侧收缩使舌尖偏向同侧
【单选题】短时间采集环境空气中二氧化硫样品时,采用内装10mL( )吸收液的U形( )吸收管,以( )L/min的流量进行采样。空气中的二氧化硫被缓冲溶液吸收后,生成稳定的羟基甲基磺酸在碱性条件下与PRA作用,生成( )色络合物,其最大吸收波长为( )nm,用分光光度法测定。
A.
甲醛缓冲;多孔玻板;1.0;紫红;577
B.
甲醛缓冲;多孔筛板;0.5;紫红;577
C.
盐酸副玫瑰苯胺;气泡式;1.0;砖红;577
D.
盐酸副玫瑰苯胺;气泡式;0.5;砖红;575
【单选题】分光光度法测大气中二氧化硫浓度的测定采用(  )方式采样。
A.
注射器采样
B.
采气袋采样
C.
溶液吸收法
D.
低温冷凝法
【简答题】采用定电位电解法测定固定污染源排气中二氧化硫时,氟化氢、硫化氢对二氧化硫测定无影响,烟尘含量、采气流速的大小对测定值也无影响。
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