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【单选题】
美国钢铁协会(AISI)以多大的铬含量作为划分不锈钢种与其他钢种的界限?A.
4%
B.
11%
C.
10.5%
D.
12%
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反馈参考答案：
举一反三
【简答题】(以某种结果)告终;(在某一点)结束
【单选题】Binding energy between an enzyme and a substrate contributes to catalysis in which way?
A.
Binding energy provides the enzyme specificity for the substrate.
B.
Binding energy contributions allow for entropy reduction in the substrate-enzyme complex.
C.
Binding energy compensates for energy changes as a result of desolvation of the substrate.
D.
Binding energy contributes to the process of induced fit between the substrate and the enzyme.
E.
All of the answers are correct.
【简答题】下面程序的功能是将n行n列的矩阵转置。请填空。 #include #define N 4 main( ) { int i,j,t; int a[N] [N]; for(i=0;i＜N;i++) for(j=0;j＜N;j++) scanf("%d",&a[i] [j]); for(i=0;i＜N;i++) for(j=0; ______;j++) { t=a[i] [j] ; ______...
【简答题】______ are composites with tungsten, silica coated with graphite, or carbon filaments as a substrate upon which boron is deposited by a vapor-deposition process (CVD).
【判断题】According to Canale and Swain (1980), communicative competence entails three dimensions.()
A.
正确
B.
错误
【单选题】刘某,男,43岁,患冠心病,近期心绞痛频发,医生给予硝酸甘油,并特别嘱其要 下含服,而不采用口服,这是因为
A.
可使毒性反应降低
B.
防止耐药性产生
C.
可使副作用减小
D.
D 避开首关消除
E.
防止产生耐受性
【单选题】Which statement is TRUE of the binding energy derived from enzyme-substrate interactions?
A.
It cannot provide enough energy to explain the large rate accelerations brought about by enzymes.
B.
It is sometimes used to hold two substrates in the optimal orientation for reaction.
C.
It is the result of covalent bonds formed between enzyme and substrate.
D.
Most of it is derived from covalent bonds between enzyme and substrate.
E.
Most of it is used up simply binding the substrate to the enzyme.
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