实体之间的联系可以归结为一对一的联系，一对多的联系与多对多的联系。如果一个学校有许多

滤线栅是由许多薄的铅条和易透过X线的低密度物质作为充填物，交替排列组成的。在X线摄影中使X线的中心线对准滤线栅板中心，原射线投射方向与滤线栅的铅条排列间隙在同一方向上，能通过铅条间隙而到达胶片产生影像。由于被照体产生的散射线是多中心、多方向的，其中大部分散射线被铅条所吸收，只有一小部分通过。滤线栅的指标：（1）栅比（R）：滤线栅铅条高度与填充物幅度的比值为栅比。（2）栅密度（n）：n表示在滤线栅表面上单位距离（1cm）内，铅条与其间距形成的线对数，常用线／厘米表示。

滤线栅使用原则中，X线管管电压须超过（）

A.55kV

B.60kV

C.65kV

D.70kV

E.75kV

大量咯血指的是（）

A.每日咯血量100ml

B.每日咯血量200ml

C.每日咯血量300ml

D.每日咯血量在500ml以上

E.一次咯血量80ml

下列各项中，不属于会计档案的是( )。

A．记账凭证
B．原始凭证
C．董事会会议记录
D．会计报告

当机体需要减缓身体的活动、抑制体内各器官的过度兴奋，起作用的是（）

A.交感神经系统

B.副交感神经系统

C.边缘系统

D.下丘脑

Despite much loose talk about the new global economy, today’s international economic integration is not unprecedented. The 50 years before the first world war saw large cross-border flows of goods, capital and people. That period of globalization, like the present one, was driven by reductions in trade barriers and by sharp falls in transport costs, thanks to the development of railways and steamships. The present surge of globalization is in a way, a resumption (恢复) of that previous trend. The earlier attempt at globalization ended abruptly with the first world war. after which the world moved into a period of fierce trade protectionism and tight restrictions on capital movement. During the early 1930s, America sharply increased its. tariffs, and other countries retaliated (报复), making the Great Depression even greater. The volume of world trade fell sharply. International capital flows virtually dried up in the interwar period as governments imposed controls to try to insulate (隔离) their economies from the impact of a global slump.

Capital controls were maintained after the second world war, as the victors decided to keep their exchange rates fixed on arrangement known as the Bretton Woods System, named after the American town in which it was approved. But the big economic powers also agreed that reducing trade barriers was vital to recovery. They set up the General Agreement on Tariffs and Trade (GATT), which organized a series of negotiations that gradually reduced import tariffs. GATT was replaced by the World Trade Organization (WTO) in 1995. Trade flourished.

In the early 1970s, the Bretton Woods System collapsed and currencies were allowed to float against one another at whatever rates the markets set. This signaled the rebirth of global capital market. America and Germany quickly stopped trying to control the inflow and outflow of capital, Britain abolished capital controls in 1979 and Japan (mostly) in 1980. This is part of the reason why continental Europeans tend to worry more about the power of global capital markets. America has been exposed to them for much longer.

Two forces have been driving these increased flows of goods and money. The first is technology. With the costs of communication and computing falling rapidly, the natural barriers of time and space that separate national markets have been falling too. The second driving force has been liberalization. As a result of both the GATT negotiations and unilateral (单方面的，单边的) decisions, almost all countries have lowered barriers to foreign trade. Most countries have welcomed international capital as well.

Technology has been a driving force of the increased flows of goods and money in that （）。

A. it has lowered the costs of communication and computing

B. it has removed all the natural barriers of time and space

C. it has reduced the barriers of foreign trade

D. it has enabled most countries to welcome foreign capital