智能决策支持系统

在“用单摆测定重力加速度”实验中，为了避免小球做圆锥摆运动，改为用双线摆悬挂小球．如图所示，两根线的一端都系在小球表面的P点，另一端分别系在固定的水平杆A、B两点，AP长为L，与水平杆的夹角为30°，小球直径为d．现将小球垂直纸面向外拉动，使悬线偏离竖直方向一个很小的角度后由静止释放，并同时开始用秒表测量摆球完成50次全振动所用的时间t．

①该摆的摆长为______．

②上述实验存在的错误是______．

上皮钉突不会出现在（）

A.扁平苔藓

B.盘状红斑狼疮

C.根尖囊肿

D.良性黏膜类天疱疮

E.都不会出现

Passage twoEducating girls quite possibly yields a higher rate of return than any other investment available in the developing world .women’s education may be unusual territory for economists ,but enhancing women’s contribution to development is actually as much an economic as a social issue .and economics ,with its emphasis on incentives ,provides guideposts that point to an explanation for why so many girls are deprived of an education Parents in low-income countries fail to invest in their daughters because they do not expert them to make an economic contribution to he family :girls grow up only to marry into somebody else’s family and bear children .Girls are thus seen as less valuable than boys and kept at home to do housework while their brothers are sent to school-the prophecy becomes self-fulfilling ,trapping women in a vicious circle of neglect. An educated mother ,on the other hand ,has greater earning abilities outside the home and faces an entirely different set of choices. She is likely to have fewer but healthier children and can insist on the development of all her children ,ensuring that her daughters are given a fair chance .The education of her daughters then makes it much more likely that the next generation of girls ,as well as of boys ,will be education and healthy . The vicious circle is thus transformed into a virtuous circle. Few will dispute that education women has great social benefits.But it has enormous economic advantages as well .Most obviously ,there is the direct effect of education on the wages of female workers.Wages rise by 10 to 20 percent for each additional year of schooling. Such big returns are impressive by the standard of other available investments ,but they are just the beginning .Education women also has a significant impact on health practices,including family planning.

The author argues that educating girls in developing countries is ( )

A．troublesome

B．labor –saving

C． rewarding

D．expensive

西方国家1万例麻醉期间死亡的原因中，完全由麻醉引起的约（）

A.1～2例

B.3～4例

C.5～6例

D.7～8例

E.9～10例

临床上进行尸体护理的依据是

A．医生做出的死亡诊断
B．各种反射消失
C．脑电波消失
D．尸僵
E．呼吸丧失