前 * * 单纯性狭窄是指单发而无并发症，且狭窄长度A．＜1cm B．＜1.5cm C．＞

参与氧化脱氨基的是（）。

A.天冬氨酸转氨

B.乳酸脱氢酶

C.HMG-CoA还原酶

D.丙酮酸羧化酶

E.琥珀酰CoA转硫酶

材料一 1937年——1942年侵华陆军在日本陆军总数中所占比例：

材料二罗斯福曾对他的儿子说：“假如没有中国……日本可以马上打下澳洲，打下印度……一直冲向西……和德国配合起来，举行一个大规模的夹攻，在近东会师，把俄国完全隔离起来，并吞并埃及，切断通过地中海的一切交通线。”——小罗斯福《罗斯福见闻秘录》

结合有关背景，根据材料内容评价中国战场对世界反法西斯战争做出的贡献（表述成文，字数在150字左右）

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DBAS指的是

A．数据库管理系统

B．数据库系统

C．数据库应用系统

D．操作系统

Internet is a vast network of computers that connects many of the world’s businesses, institutions, and individuals. (46) The Internet, which means interconnected network of networks, links tens of thousands of smaller computer networks. These networks transmit huge amounts of information in the form of words, images, and sounds.

The Internet has information on every topic.(47)Network users can search through sources ranging from vast databases to small electronic" bulletin boards", where users form discussion groups around common interests. Much of the Internet’s traffic consists of messages sent from one computer user to another. These messages are called electronic mail or e-mail. Internet users have electronic addresses that allow them to send and receive e-mail. Other uses of the network include obtaining news, joining electronic debates, and playing electronic games.(48)One feature of the Internet, known as the World Wide Web, provides graphics, audio, and video to enhance the information in its documents. These documents cover a vast number of topics.

People usually access the Internet with a device called a modem. Modems connect computers to the network through telephone lines. Much of the Internet operates through worldwide telephone networks of fiber-optic cables(49) These cables contain hair-thin strands of glass that carry data as pulses of light. They can transmit thousands of times more data than local phone lines, most of which consist of copper wires.

In the future, the internet will probably grow more sophisticated as computer technology becomes more powerful. (50)Many experts believe the Internet may become part of a larger network called the information superhighway. This network, still under development, would link computers with telephone companies, cable television stations, and other communication systems. People could bank, shop, watch TV, and perform many other activities through the network.

(46) The Internet, which means interconnected network of networks, links tens of thousands of smaller computer networks. These networks transmit huge amounts of information in the form of words, images, and sounds.

机械检修的主要内容有哪些方面？