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【单选题】
有两个放大倍数相同,输入和输出电阻不同的放大电路A和B,对同一个有内阻的信号源电压进行放大,在负载开路条件下,测得A的输出电压小这说明A的( )A.
输入电阻大
B.
输入电阻小
C.
输出电阻大
D.
输出电阻小
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举一反三
【单选题】The grammatical meanings of a word refer to that part of the meaning of the word which indicates grammatical concept or relationship such as ____.
A.
part of speech of words
B.
singular and plural meaning of nouns
C.
tense meaning of verbs and their inflectional forms
D.
all the above
【简答题】原核生物DNA合成时,先由( )合成RNA引物,再由( )在其3’端合成DNA链
【简答题】原核生物转录时,首先由 识别并结合到DNA上的 ,延伸阶段由 催化 键的形成,转录的终止信号是 ,它是由 辅助识别的。
【单选题】is typically used to refer to the study of a particular idea or concept within many cultures. The goal of such investigations is to conduct a series of intercultural analyses in order to compare on cu...
A.
Interethnic communication
B.
Interracial communication
C.
Cross-cultural communication
D.
Intercultural communication
【简答题】J. R. Firth's main approach to the notion of function in context was by means of concept system. People refer to his theory as ______ theory.
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