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【单选题】
学者必有师
A.
:求学的人; 今义:指在学术上有一定成就的人
B.
:求学的人; 今义:有学问的老人
C.
: 指在学术上 有一定成就的人 ; 今义: 求学的人
D.
:讲学的人; 今义:指在学术上有一定成就的人
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举一反三
【单选题】What should we pay attention to when maceration, dissolution, extraction, partition and concentration were used for sample preparation?
A.
Maceration, dissolution and extraction: homogenise the sample as soon as possible to facilitate a uniform and efficient extraction of analytes from the sample matrix prior to partition, beside that a degree of matrix integrity (heterogeneity) needs to be maintained;
B.
C oncentration: The definition and inclusion for essential element are not the same in plant and animal systems. Because the trace elements essential for plants are those elements which cannot be substituted by others in their specific biochemical roles and that have a direct influence on the organism so that it can neither grow nor complete some metabolic cycle.
C.
P artition: transfer of an analyte or analytes from the extractant to the partitioning solvent with high efficiency;
D.
C oncentration: do not reduce the volume of solvent by the application of too much heat, which may lead to some alteration or decomposition of the analyte. It is better to use a lower temperature, at reduced pressure if possible, to expedite rapid solvent removal. Once the solution has been reduced to a small volume, ca. 5 cm 3 , a more prudent method is to direct a stream of dry nitrogen gas onto the surface of the extract.
【简答题】You can tell the age of a tree by counting its rings, but these records of trees' life really say a lot more. Scientists are using tree rings to learn what's being happening on the sun's suce for t...
【简答题】局麻药的化学结构可概括为三部分,即{1}、{2}和亲水部分。
【单选题】听力原文: Up to about 1915, movies were short and programs were made up of several works. Then, D. U. Griffith and others began to make longer films which provided the same powerful emotional appeal as di...
A.
Films provided more melodrama.
B.
Films provided longer programs.
C.
Films provided emotional appeal.
D.
Films provided greater spectacles.
【判断题】唇膏的选用要与肤色相配,肤色较白的人选择偏红色。 ( )
A.
正确
B.
错误
【判断题】唇膏的选用要与肤色相配,肤色较白的人选择偏红色。
A.
正确
B.
错误
【判断题】唇膏的选用要与肤色相配,肤色较白的人选择偏红色。
A.
正确
B.
错误
【判断题】( )唇膏的选用要与肤色相配,肤色较白的人涂浅红色。
A.
正确
B.
错误
【判断题】唇膏的选用要与肤色相配 , 肤色较白人涂浅红色。( )
A.
正确
B.
错误
【单选题】唇膏的选用要与肤色相配,一般来说偏红色适于( )。
A.
深黑皮肤
B.
肤色较白者
C.
肤色偏黄者
D.
红润皮肤
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