自发性结实

存款准备金制度作为一种货币政策工具，其优点是( )。

A．商业银行拥有自主权

B．中央银行拥有自主权

C．对货币供应量作用迅速

D．政策效果很大程度上受超额准备金的影响

伤寒最显著的病理改变部位是在()

A．肠系膜淋巴结

B．回盲部

C．回肠下段的集合淋巴结和孤立的淋巴细胞

D．乙状结肠

E．脾脏

恶性肿瘤的保肢重建技术有（）

A.关节融合术

B.人工假体置换术

C.肿瘤灭活再植术

D.带血管自体骨移植术

E.骨延长术

In the world of climate change, it is in the Earth’s cold regions where trends can most easily be seen. The cryosphere, where water is found in solid form, is among the most sensitive regions to temperature change.

The sensitivity of ice and snow to temperature changes is an early indicator of even relatively small differences, says University of Colorado at Boulder senior researcher Richard Armp. He has found that today’s receding and thinning sea ice, mountain glacier mass losses, decreasing snow extent, melting permafrost (永久冻土), and rising sea level are all consistent with warming.

Global mean temperatures have risen one degree Fahrenheit over the past 100 years. with more than half of the increase occurring in the last 25 years, observes Armp who is affiliated with the National Snow and Ice Data Center headquartered at CU-Boulder.

"As slight as that may seem, it’s enough to make a difference, " said Armp. "Now, long-term monitoring of a series of cold region, or cryospheric, parameters (参数) shows that for several decades the amounts of snow and ice around the world have been decreasing. "

The extent of Arctic sea ice is shrinking by about 3 percent per decade. but the trends are not uniform. While recent studies have indicated that the ice thickness also had decreased over several decades, new information shows that the ice may have thinned rapidly, Armp said. Examination of springtime ice thickness in the Arctic Ocean indicates that the mean ice thickness decreased 1.5 meters (4.8 feet) between the mid-1980s and early 1990s.

To mark its 25^th anniversary, the National Snow and Ice Data Center has organized a special session at the 2001 Fall Meeting of American Geophysical Union, taking place this week in San Francisco, that illuminates overall changes in the cryosphere.

The session begins Tuesday and extends through Thursday afternoon, with 75 contributions from all areas of cryospheric study. Papers and posters include examinations of lake and river ice, glacier dynamics, and mass ice balance studies in polar and continental glaciers, regional and polar snow cover trends, and variations in Canadian ice cap elevations.

Studies have indicated that（）。

A. the extent of Arctic sea ice has shrunk by about 3% in the past several decades

B. the mean ice thickness in the Arctic Ocean decreased 1.5 meters in the 1990s

C. the amount of ice around the world has been decreasing for several decades

D. the ice thickness decreased most rapidly between the mid-1980s and the 1990s

做好企业技术业务培训工作应（）。

A、建立职工教育机构

B、组织全员脱产学习

C、围绕政治学习

D、避免内部竞争