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【单选题】
在某8位定点机中,寄存器内容为10000000,若它的数值为-128,则它采用的数据表示为( )。A.
原码
B.
补码
C.
反码
D.
都不是
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【简答题】如何利用三层交换机实现VLAN间路由?
【单选题】Techniques are available to allow one to introduce mutations in proteins at a selected amino acid residue (site-directed mutagenesis). Which step of the signal transduction pathway would be blocked if...
A.
Grb2 binding to the receptor to propagate the response
B.
Binding of the growth factor to the receptor
C.
Induction of a conformational change in the receptor upon growth factor binding
D.
Activation of the receptor ’ s intrinsic tyrosine kinase activity
E.
Dimerization of the receptors
【单选题】Chaucer has employed ________ in his poems, which was the predominant English measure for all the poetic kindsfrom the age of John Dryden through that of Samuel Johnson, some poets, including Alexande...
A.
, heroic couplet
B.
, blank verse
C.
, sonnet
D.
, octet and sestet
【单选题】-How was it _____ little John had done resulted in so much improvement? -Through his great skills obtained by years of hard work and practice.
A.
that whether
B.
whether that
C.
that what
D.
what that
【简答题】The translation of an mRNA begins with the codon _______, for which a special charged tRNA is required. This initiator tRNA always carries the amino acid methionine (or a modified form of methionine, ...
【判断题】A description of all covalent bonds (mainly peptide bonds and disulfide bonds) linking amino acid residues in a polypeptide chain is its secondary structure.
A.
正确
B.
错误
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