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【单选题】
下面关于函数依赖的描述,错误的是_____。A.
若X→Y、X→Z,则X→YZ
B.
若XY→Z,则X→Z、Y→Z
C.
若X→Y、Y→Z,则X→Z
D.
若X→Y,则XZ→Y
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反馈参考答案：
举一反三
【多选题】Resources brought from the environment to organizations include ( ).
A.
Physical materials
B.
People
C.
Information
D.
Organizational departments
【单选题】A serious outcome brought out by the shortage of resources is that______
A.
many public institutions have to cut down enrollments of students
B.
teachers are not qualified enough for satisfactory performance in classes
C.
some institutions have to reduce the expenses on research
D.
there is keen competition for resources and attention of faculty between public and private
【简答题】HTTP 协议是 的英文缩写。
【单选题】下列叙述错误的是：
A.
A. File 类能够存储文件 不
B.
A. File 类能够读写文件
C.
A. File 类能够建立文件
D.
A. File 类能够获取文件目录信息
【单选题】6月1日为“世界牛奶日”．某品牌牛奶富含蛋白质、糖类、无机盐等营养物质．下列叙述错误的是（ ）
A.
蛋白质、糖类都属于有机物
B.
青少年常饮牛奶有利于骨骼生长
C.
误食重金属盐可以立即喝大量牛奶
D.
蔗糖与碘水作用呈蓝色
【单选题】A serious outcome brought out by the shortage of resources is that______.
A.
many public institutions have to cut down enrollment of students
B.
teachers are not qualified enough for satisfactory performance in classes
C.
some institutions have to reduce the expenses on research
D.
there is competition for resources and attention of faculty between public and private institution
【单选题】下列属于克隆的一项是
A.
将鸡的某个DNA片段整合到小鼠的DNA分子中
B.
将抗药菌的某基因引入草履虫的细胞内
C.
将小鼠骨髓瘤细胞与经过免疫的脾细胞融合成杂交瘤细胞
D.
将某种瘤细胞在体外培养繁殖成一个细胞系
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