事业单位以固定资产对外投资，该固定资产账面余额60000元，已提折旧20000元，市

脊柱肿瘤的腰背痛特点不正确的是

A．休息和药物均难以缓解

B．顽固性腰背痛，剧烈而持续

C．有放射性神经根痛

D．以上都不是

E．以转移性恶性肿瘤多见

气管切开手术常在何处进行？

女，34岁，经常反复发作剧烈的右上腹痛，加重1天。声像图如图所示，最可能的诊断为（）

A.肝内胆管结石

B.肝内胆管癌

C.肝内胆管蛔虫

D.肝内胆管积气

E.引流管回声

What began with the invention of the telephone in 1876 has today become a global net of cables, satellites, transmitters, and receivers that enables half the population of the planet to exchange works, data, and images in seconds. It could take less than 25 years more to give the other half of the world’s people this same power.

The unified global telecommunications system, which is called "the Meganet", represents the greatest construction project ever undertaken. If present trends continue, by early in the 21^st century the Meganet will link every computer terminal, fax machine, databank, and telephone instrument on earth.

Unlike its anarchic (无政府主义的) cousin the Internet, which evolved from free interaction among interest groups of computer users. the Meganet of local telephone service, long-distance lines, communications satellites, and mobile relays has been planned, constructed, regulated and largely sponsored by governments and for-profit business interests. As new materials and technologies bring reliable voice and data links to formerly isolated or closed communities, political and economic power struggles grow.

The Meganet breaks long-established patterns of social identity and responsibility. Where private individuals have uncensored access to global information sources, local standards of legality or decency become difficult even to set, let alone to enforce. Economic values may shift, too. Public utility companies have long supplied electric power over miles of high-tension lines, or pumped water through underground pipelines into thousands of homes. Now they are finding that their power-line rights-of-way and physical into-home connections let them compete with cable TV and phone companies to supply information services as well.

Meganet impacts are often double-edged for finance and business, too. New York’s Wall Street district lost 20% of its work force—some 100000 jobs—in less than a decade, as computers took over tasks once performed by clerks and banks did more of their business by phone transfers and automated teller machines.

According to the passage, what is the difference between "the Meganet" and Internet（）。

A. Both of them are developed by some interest groups of computer users.

B. Meganet is the continuity of Internet.

C. Meganet is planned and regulated, while Internet is disorganized.

D. Meganet has fewer users than Internet.

某建筑工程建筑面积200000m²，混凝土现浇结构，泥浆护壁成孔灌注桩基础，地下2层、地上12层，基础埋深12m，该工程位于繁华市区，施工场地狭小。工程所在地区地势北高南低，施工单位的降水方案计划在基坑南边布置单排轻型井点。基础开挖到设计标高后，施工单位和监理单位对基坑进行验槽，并对基底进行了钎探，发现地基东南角有约350m²软土区，监理工程师随即指令施工单位进行换填处理。后在施工过程中发生泥浆护壁灌注桩坍孔。

土的可松性是土经挖掘以后，组织破坏，体积增加的性质，以后虽经回填压实，仍不能恢复成原来的体积。土的可松性程度一般以( )表示。

A．可松性系数

B．可松度

C．压缩率

D．休止角