如图所示,将一把金属叉子拴在一根约lm长的线的中间把线的两端分别缠绕在双手的食指

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问题:

如图所示,将一把金属叉子拴在一根约lm长的线的中间把线的两端分别缠绕在双手的食指上,缠绕多圈,插入耳朵.然后让叉子撞到坚硬的物体上,等它垂下把线拉直时,你就可以听到敲钟似的响声.通过撞击,金属叉子 ______发声,声音主要通过 ______传递到人耳.

考点:声音的产生声音的传播
题型:问答题

一桶纯净水重19kg(含桶重),一辆载重2吨的小货车最多可装______桶纯净水.

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电流串联负反馈放大电路的反馈系数称为()反馈系数。

A.电流

B.互阻

C.互导

题型:问答题

For good or ill, globalization has become the economic buzz-word of the 1990s. National economies are undoubtedly becoming steadily more integrated as cross-border flows of trade, investment and financial capital increase. Consumers are buying more foreign goods, a growing number of firms now operate across national borders, and savers are investing more than ever before in far-flung places.

Whether all of this is for good or ill is a topic of heated debate. One positive view is that globalization is an unmixed blessing, with the potential to boost productivity and living standards everywhere. This is because a globally integrated economy can lead to a better division of labor between countries, allowing low-wage countries to specialize in labor-intensive tasks while highwage countries use workers in more productive ways. It will allow firms to exploit bigger economies of scale. And with globalization, capital can be shifted to whatever country offers the most productive investment opportunities, not trapped at home financing projects with poor returns.

Critics of globalization take a gloomier view. They predict that increased competition from low-wage developing countries will destroy jobs and push down wages in today’s rich economies. There will be a race to the bottom as countries reduce wages, taxes, welfare benefits and environmental controls to make themselves more competitive. Pressure to compete will erode the ability of governments to set their own economic policies. The critic also worry about the increased power of financial markets to cause economic havoc, as in the European currency crises of 1992 and 1993, Mexico in 1994~1995 and South-East Asia in 1997.

National economies are becoming more integrated as a result of ().

A. increasing flows of cross-border trade, investment and financial capital

B. more and more consumers going abroad to buy goods

C. many companies establishing new businesses

D. savers investing more in developed areas than in developing countries

题型:问答题

铁口浅时,相应增加打泥量,铁口深度正常时,打泥量要稳定,铁口过深时,打泥量应适当减少。

题型:问答题

《海牙公约》中对劫持民用航空器的犯罪定义()

1.用暴力或用暴力威胁,非法劫持或控制该航空器

2.用其他精神胁迫方式,非法劫持或控制该航空器

3.包括上述行为的未遂行为

4.包括上述行为的共犯

A.12

B.134

C.234

D.1234

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