已知ab=23,且a+b=10,则a-b=______.

题型:填空题

问题:

已知
a
b
=
2
3
,且a+b=10,则a-b=______.
考点:比例的性质
题型:填空题
已知复数z满足:|z|=1+3i-z,求
(1+i)2(3+4i)2
2z
的值.
题型:填空题
已知函数y=Asin(ωx+φ)+C(A>0,ω>0,|φ|<
π
2
)在同一周期中最高点的坐标为(2,2),最低点的坐标为(8,-4).
(I)求A,C,ω,φ的值;
(II)求出这个函数的单调递增区间.
题型:填空题

Jack is late again. It is _____ of him to keep others waiting.

A.normal

B.typical

C.common

D.ordinary

题型:填空题

某多层现浇网筋混凝土结构,设两层地下车库,局部地下一层外墙内移,如图所示。设计使用年限为50年,结构安全等级为二级。已知室内环境类别为一类,室外环境类别为二b类,混凝土强度等级均为C30。

方案比较时,假定框架梁KL1截面及配筋如图所示,。支座截面剪力设计值V=1600kN,对应的轴向拉力设计值N=2200kN,计算截面的剪跨比λ=1.5,箍筋采用HRB335级钢筋。试问,非抗震设计时,该梁支座截面处的按矩形截面计算的箍筋配置选用下列何项最为合适()

提示:不考虑上部墙体的共同作用。

A.

B.

C.

D.

题型:填空题

Being able to multitask---doing several things at the same time---is considered a welcome skill by most people. But if we consider the situation of the young people aged from eight to eighteen, we should think again.

What we often see nowadays is that young people juggle an ever larger number of electronic devices as they study. While working, they also surf on the Internet, send out emails, answer the telephone and listen to music on their iPods. In a sense, they are spending a significant amount of time in fruitless efforts as they multitask.

Multitasking is even changing the relationship between family members. As young people give so much attention to their own worlds, they seem to have no time to spend with the other people around them. They can no longer greet family members when they enter the house, nor can they eat at the family table.

Multitasking also affects young people’s performance at university and in the workplace. When asked about their opinion of the effect of modern gadgets on their performance of tasks, many young people gave a positive response. However, the response from the worlds of education and business was not quite as positive.

Educators feel that multitasking by children has a serious effect on later development of study skills. They believe that many college students now need help to improve their study skills. Similarly, employers feel that young people entering the job market need to be taught all over again, as modern gadgets have made it unnecessary for them to learn special skills to do their work.

小题1:What does the underlined word “juggle” in Paragraph 2 most probably mean?

A.Want to buy.

B.Take the place of.

C.Use at the same time.

D.Seek for information from.小题2:In Paragraph 3, the author points out that  ________.

A.family members do not eat at the family table.

B.family members do not greet each other.

C.young people live happily in their families

D.young people seldom talk with their family members小题3:What is the main idea of the last paragraph?

A.multitasking is harmful to young people’s development.

B.Young people benefit a lot from modern gadgets.

C.Multitasking is an important skill to young people.

D.Yong people must learn skills for future jobs.小题4:The author develops the passage mainly by ________.

A.providing typical examples

B.following the natural time order

C.comparing opinions from different fields

D.presenting a cause and analyzing its effects

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