热交换器是冷却器和加热器的总称,冷却器一般安装在回油管路或低压管路上。

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问题:

热交换器是冷却器和加热器的总称,冷却器一般安装在回油管路或低压管路上。

考点:液压与气动技术液压传动与控制液压传动与控制题库
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By 2010 the European Commission predicts transcontinental freight traffic will have risen 50 percent as a result of European expansion, and much of that will have to cross the enormous obstacle of the Alps. Right now the only practical way for most heavy traffic to get through is by truck and tunnel. And while that could change if safer and cleaner rail lines were opened, the chances are that won’t happen anytime soon.

Several private trucking companies have adapted quickly and creatively to the demands of European unification. Some of the bigger truckers trace cargoes with the Global Positioning System and sophisticated computers. And if trucks also bring more road hazards and pollution, at present there is no alternative. Right now only 8 percent of European merchandise moves by rail, compared with more than 40 percent in the United States. Delays are so common that the average speed for freight is about 18km an hour.

The railways have had trouble outgrowing a heritage of national rivalries and open warfare between Europe’s countries. The result is what another European Commission report calls "a mosaic of badly interconnected national systems. " Language barriers remain a problem, requiring crew changes at some borders. Switching systems and signals differ.

And efficiency is more of a dream than a goal. Europe’s railroads still have to deal with "phantom trains" that run so late that they combine with others and disappear from the railroad’s records. In an era when many companies depend on a "just-in-time" inventories to make a profit, railroads are rarely on time at all.

Yet there is little official enthusiasm for changing the system. The reality is that governments have helped create the imbalance between road and rail in Europe—and government action will likely be needed to fix it. The French emphasis on using rail to move people instead of goods, for instance, has helped cripple freight service. "All the investments went to passenger traffic," says Denis Douté, director of freight services for the French rail company SNCF. Freight trains have had to find "windows" to run in between passenger trains, unlike those in the United States, which often travel on separate tracks. The further development of the freight network requires massive investments to modernize existing infrastructure and open new ones. However, the political will to fund that kind of investment is lacking, which means the citizens will have to hold their noses for a while longer.

The word "phantom" (Line 2, Para. 4) probably means ().

A. trouble

B. ghost

C. hero

D. turtle

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市场风险包括利率风险、汇率风险、股票风险和商品风险四种,其中利率风险尤为重要。()

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盐都世纪公园景墙上刻画了盐城的历史名人,其中盐城籍的有()。

A、孙坚

B、陆秀夫

C、宋曹

D、陈琳

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人体在深夜里要比在白天分泌更多的抑制疼痛的荷尔蒙。因此,在夜间进行手术的外科病人需要较少的麻醉剂。因为大量的麻醉剂会对病人造成较大的危险,所以如果手术经常在夜间进行,就会减少外科手术的风险。
以下哪项如果为真,最能反驳上述的结论( )

A.生在午夜至早上7点之间的婴儿要比在其他时间的多
B.在一年期间,人的生物钟对人们暴露于日光照射下的数量的变化有所反应而发生轻微的转变
C.尽管一些人已习惯于夜间工作,但在夜间其手的灵巧程度和精神警觉性不如白天好
D.医院里在夜里的能量消耗通常比在白天少

题型:判断题

根据恶性淋巴瘤的侵犯范围,将它分为几期

A.二期
B.三期
C.四期
D.五期
E.六期

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