把许多生产企业的产品加以集中采购和推销属于（）的功能。

关于胸骨角的描述正确的是（）。

A.胸骨体与剑突连接处形成

B.两侧连接第3肋

C.微向后凸出

D.胸骨柄和胸骨体连接形成的角

E.参与构成胸锁关节

请建立如下的表格，计算D列的“总计”，其数据表保存在sheet 1工作表中。

	A	B	C	D
1	某厂各车间1月份生产情况
2	车间	数量	价格(元)	总计
3	1	4	12000
4	2	5	9000
5	3	6	8500
6	4	12	6500

2．对建立的数据表选择“车间”和“总计”数据建立“三维簇状柱形图”，图表标题为“粮食产量图”，并将其嵌入到工作表的A9:F20区域中。将工作表sheet1更名为“1月份生产表”，保存到EX20.XLS。

Americans are much more likely than citizens of other nations to believe that they live in a meritocracy, i.e. Government by people selected according to merit. But this self-image is a fantasy: America actually stands out as a the advanced country in which it matters most who your parents were, the country in which those born on one of society’s lower rungs have the least chance of climbing to the top or even to the middle.　　And if you ask why America is more class-bound in practice than the rest of the Western world, a large part of the reason is that our government falls down on the job of creating equal opportunity.　　The failure starts early: in America, the holes in the social safety net mean that both low-income mothers and their children are all too likely to suffer from poor nutrition and receive inadequate health care. It continues once children reach school age, where they encounter a system in which the affluent send their kids to good, well-financed public schools or, if they choose, to private schools, while less-advantaged children get a far worse education.

国有资本、集体资本、非公有资本等交叉持股、相互融合的混合所有制经济，是基本经济制度的重要实现形式。发展混合所有制经济有利于（）①促进社会主义市场经济的发展②推动投资主体多元化③维护和巩固基本经济制度④确保非公资本的生存空间日益扩大

A.①②③

B.①②④

C.①③④

D.②③④

X线摄片是利用了以下哪些X线特征（）

A.荧光效应

B.摄影效应

C.电离效应

D.穿透性

E.多普勒效应