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【单选题】
影响溶解度的因素不包括（）A.
药物的极性
B.
溶剂
C.
温度
D.
药物的颜色
E.
药物的晶型
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反馈参考答案：
举一反三
【单选题】Suppose we have the relation schema R( A, B, C, D)with functional dependencies; F{A→B,B→C,C→D,D→A}, then R(A,B,C,D. at least is in(73).
A.
1NF
B.
2NF
C.
3NF
D.
BCNFThe construct eobegin Statement1; Statement2; coend means Statement1 and Statement2 are to be executed in parallel. The only two atomic actions in this construct are loading the value of a variable and storing into a variable. For the p
【单选题】Suppose we have two relations R(A,B,C) and S(B,C,D) ,then the attributes number of the result of R÷S is:
A.
3
B.
2
C.
1
D.
Uncertain
【判断题】For the relation Apply(SSN,cName,state,date,major), suppose college names are unique and students may apply to each college only once, so we have two FDs: cName → state and SSN,cName → date,major. App...
A.
正确
B.
错误
【单选题】For the relation Apply(SSN,cName,state,date,major), suppose college names are unique and students may apply to each college only once, so we have two FDs: cName → state and SSN,cName → date,major. Is ...
A.
Yes
B.
No
【简答题】已经知道每个正常人的体细胞中都含有23对染色体．如图是人类生殖过程中染色体变化示意图，请据图回答问题： （1）请在图中画出精子、卵细胞、受精卵细胞中的染色体和基因． （2）在形成精子（或卵细胞）过程中，体细胞每对染色体中的______条进入精子（或卵细胞），人体的正常受精卵中含有______条染色体． （3）若图中所示的是一对性染色体，父方体细胞中性染色体组成为______，母方卵细胞的染色体组成...
【判断题】Suppose we operate a company that produce two kinds of products: shirts and jeans. As we continue to increase production level of shirt, each additional shirt we produced will have fixed opportunity c...
A.
正确
B.
错误
【单选题】下列关于证券估值的说法中不正确的有( )。
A.
任何金融资产的估值都是资产期望创造现金流的现值
B.
带息债券发行时，票面利率一般会设定在使债券市场价格等于其面值的水平
C.
带息债券发行时，票面利率一般会设定在使债券市场价格高于其面值的水平
D.
债券的估值方法也可用于优先股估值
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