设集合U={1,2,3,4,5},A={1,2,B=2,3,4},则∁U(A∪B

题型:选择题

问题:

设集合U={1,2,3,4,5},A={1,2,B=2,3,4},则∁U(A∪B)等于(  )

A.{2}

B.{5}

C.{1,2,3,4}

D.{1,3,4,5}

考点:集合间交、并、补的运算(用Venn图表示)
题型:选择题

People are indulging in an illusion whenever they find themselves explaining at a cocktail (鸡尾酒) party, say, that they are "in computers," or "in telecommunications," or "in electronic funds transfer". The implication is that they are part of the high-tech world. Just between US, they usually aren’t. The researchers who made fundamental breakthroughs in those areas are in a high-tech business. The rest of us are ()of their work. We use computers and other new technology components to develop our products or to organize our affairs. Because we go about this work in teams and projects and other tightly knit working groups(紧密联系在一起的工作小组), we are mostly in the human communication business. Our successes stem from good human interactions by all participants in the effort, and our failures stem from poor human interactions.

The main reason we tend to focus on the()rather than the human side of the work is not because it’s more (), but because it’s easier to do. Getting the new disk drive installed is positively trivial compared to figuring out why Horace is in a blue funk (恐惧) or why Susan is dissatisfied with the company after only a few months. Human interactions are complicated and never very crisp (干脆的, 干净利落的) and clean in their effects, but they matter more than any other aspect of the work.

If you find yourself concentrating on the()rather than the (), you’re like the vaudeville character (杂耍人物) who loses his keys on a dark street and looks for them on the adjacent street because, as he explains, "The light is better there!".

The rest of us are () of their work.

A.creators

B.innovators

C.appliers

D.inventors

题型:选择题

患者,女,13岁,面中1/3略突,面下1/3高度正常,上颌前牙舌倾,下前牙直立,磨牙轻远中关系,上颌拥挤4mm,下颌拥挤1mm。

对此病人的矫治设计最可行的是()

A.非拔牙

B.拔除双侧上颌第一双尖牙

C.拔除上颌第一双尖牙和下颌第二双尖牙

D.拔除上颌第二双尖牙和下颌第二双尖牙

E.拔除上颌第二双尖牙

题型:选择题
某二元方程的解是
x=m
y=m2+m+1
,若把x看作平面直角坐标系中点的横坐标,y看作是纵坐标,下面说法正确的是(  )
A.点(x,y)一定不在第一象限
B.点(x,y)一定不是坐标原点
C.y随x的增大而增大
D.y随x的增大而减小
题型:选择题

男性,18岁,上呼吸道感染后2天出现血尿,尿常规蛋白阴性、尿红细胞满视野。

提问:首先考虑的诊断是()

A.急性肾小球肾炎

B.IgA肾病

C.急进性肾小球肾炎

D.尿路感染

E.尿路结石

F.慢性肾炎急性发作

题型:选择题

三显示自动闭塞区段,车站发出货物列车时,运行前方最少应有()闭塞分区空闲。

A.1个

B.2个

C.3个

D.4个

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