目前DNA测序仪的工作原理,主要是利用______和______。
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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.
压力高的输液泵是高效液相色谱仪的关键部件之一,按其工作原理分为______和______两大类。
性格的意志特征是人在对自己行为的自觉调节方式和水平方面的特征。()
医护心理学既是一门基础学科,又是一门应用学科。()