城市生活垃圾的混合浓缩采用的方法为（）。 A.堆锥法 B.环锥法 C.圆锥四分法 D

m=10·n，m和n成（    ）关系。 

单向阀具有重要作用，通常用在液压系统的（）部分。

A.工作回路

B.执行回路

C.动力

D.控制回路

At the Kyoto conference on global warming in December 1997, it became abundantly clear how complex it has become to work out international agreements relating to the environment because of economic concerns unique to each country. It is no longer enough to try to forbid certain activities or to reduce emissions of certain substances. The global challenge of the interlink between the environment and development increasingly bring us to the core of the economic life of states. During the late 1980s we were able, through international agreements, to make deep cuts in emissions harmful to the ozone layer (臭氧层). These reductions were made possible because substitutions had been found for many of the harmful chemicals and, more important, because the harmful substances could be replaced without negative effects on employment and the economies of states.

Although the threat of global warming has been known to the world for decades and all countries and leaders agree that we need to deal with the problem, we also know that the effects of measures, especially harsh measures taken in some countries, would be nullified (抵消) if other countries do not control their emissions. Whereas the UN team on climate change has found that the emissions of carbon dioxide would have to be cut globally by 60% to stabilize the content of CO₂ in the atmosphere, this path is not feasible for several reasons. Such deep cuts would cause a breakdown of the world economy. Important and populous (人口众多的) low or medium-income countries are not yet willing to undertake legal commitments about their energy uses. In addition, the state of world technology would not yet permit us to make such a big leap.

We must, however, find a solution to the threat of global warming early in the 21^st century. Such a commitment would require a degree of shared vision and common responsibilities new to humanity. Success lies in the force of imaginations, in imaging what would happen if we fail to act. Although many living in cold regions would welcome the global-warming effect of a warmer summer, few would cheer the arrival of the subsequent tropical diseases, especially where there had been none.

According to the author, it is impossible at present to cut 60% of carbon dioxide emissions globally because ().

A. it is only a goal to be reached in the future

B. some people are lacking in imagination

C. some people are irresponsible

D. it would cause a collapse of the world economy

工程竣工验收合格并办理了移交手续，表明( )。

A．解除了承包人的所有责任

B．承包人即可获得全部工程价款

C．承包人工程施工任务的完成

D．承包人和发包人所有关系的解除

毛毡混纺有哪些特征？