气相色谱定量分析中对归一化法要求的最主要的条件是试样中所有组分都要在一定时间内分离流出______，且在检测器中产生信号。
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The author sets off the word "Reform"(line 42)with quotation marks in order to
A. emphasize its departure from the concept of settled possessiveness.
B. show his support for a systematic program of change.
C. underscore the flexibility and even amorphousness of United States society.
D. indicate that the term was one of Wilson"s favorites.
E. assert that reform. in the United States has not been fundamental.
在液-液分配色谱中，对于亲水固定液采用疏水性流动相，即流动相的极性小于固定相的极性称为______。
目前DNA测序仪的工作原理，主要是利用______和______。
The passage suggests that the factor mentioned in lines 19 — 23 complicates professors attempts to construct introductory reading lists for courses in Asian American studies in which of the following ways？
A. By making it difficult for professors to identify primary source material and to obtain standard information on Asian American history and culture.
By preventing professors from identifying excellent anthologies and introductory texts in the field that are both recent and understandable to students.
C. By preventing professors from adequately evaluating the quality of the numerous texts currently being published in the field.
D. Such courses were offered only at schools whose libraries were rich in primary sources.
E. By making it more necessary for professors to select readings for their courses that are not too challenging for students unfamiliar with Asian American history and culture.
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