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【单选题】
在独立编址方式下,下面的说法( )是对的。A.
一个具体地址只能对应输入输出设备
B.
一个具体地址只能对应内存单元
C.
一个具体地址即可对应输入输出设备，以可对应内存单元
D.
一个具体地址只对应I/O设备或者对应内存单元
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举一反三
【简答题】人类β-珠蛋白的等位基因Hba(造成镰状细胞贫血)编码蛋白的第6位由Glu变成Val，Hba中则由Glu变为Lys，两个突变的先后次序如何?
【单选题】It can be inferred from the passage that the author would be more optimistic about optical computing if which of the following were true?
A.
Digital partitioning algorithms could be applied to electronic, and not just optical circuits.
B.
The speed of photons could be shown to be significantly greater than that of electrons.
C.
The precision level in basic operations can be substantially increased without great expense.
D.
The accuracy of electronic circuits used to preprocess input data and post- process data could be greatly increased.
E.
The microchips optical computer systems were shown to require an increasing density of interconnections.
【多选题】Sequential logic circuits can be divided into the following three main categories:( )
A.
Event Driven
B.
Clock Driven
C.
Power Driven
D.
Pulse Driven
【单选题】What do you know about acid rain from the report?
A.
It' s a kind of atmosphere.
B.
It' s a kind of air pollution.
C.
It' s a kind of moisture.
D.
It' s a kind of noise pollution.
【简答题】Digital logic and electronic circuits derive their functionality from electronic switches called transistor. Roughly speaking, the transistor can be likened to an electronically controlled valve where...
【单选题】镰刀形红细胞贫血病患者Hb分子中氨基酸替换的种类和位置是
A.
β链第六位Glu→Val
B.
β链第六位Val→Glu
C.
α链第六位Glu→Val
D.
α链第六位Val→Glu
E.
以上都不是
【简答题】Using the concepts of phasor and impedance, sinusoidal circuits can be yzed in the frequency domain in a manner ogous to resistive circuits by using the phasor versions of KCL, KVL, nodal ...
【单选题】七肽 Ala-Ser-Val-Asp-Glu-Leu-Gly 形成 a - 螺旋,与 Ala 的羰基形成氢键的氨基酸残基是( )
A.
Ser
B.
Val
C.
Asp
D.
Glu
【简答题】某多肽的氨基酸序列如下：Glu-Val-Lys-Asn-Cys-Phe-Arg-Trp-Asp-Leu-Gly-Ser-Leu-Glu-Ala-Thr-Cys-Arg-His-Met-Asp-Gln-Cys-Tyr-Pro-Gly-Glu-Glu-Lys。
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