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【简答题】
Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need. A. concentrated   B. possible    C. revised     D. applications   E. figures F. connect       G. benefits     H. global     I. contribute     J. tops More than two million people in Europe now have fiber broadband (光纤宽带)direct to their home, suggests a survey. The latest __1__ on superfast broadband delivered by fiber to the home (FTTH) show 18% growth over the last survey compiled in late 2008. The continued growth suggests that the __2__ economic decline has not hit plans to build fiber networks. Sweden __3__ the list of nations applying the technology, with 10.9% of its broadband customers using fiber. Karel Helsen, president of Europe’s Fiber-To-The-Home Council, said the growth matched predictions that were __4__ when the credit crisis started to make itself felt. “The numbers in 2009 are in line with the latest forecasts,” said Mr. Helsen. By 2012, the FTTH Council expects that 13 million people across 35 European nations will have their broadband delivered by fiber. Such services would start at a speed of 100 megabits per second (mbps), said Mr. Helsen. Around Europe more than 233 projects were underway to lay the fibers that would __5__ homes or buildings to the net, said Mr. Helsen. Many of those, he said, were being operated by local governments or smaller net firms. Local governments were interested in FTTH because of the economic and social __6__ it brought in its wake, said Mr. Helsen. The low delay in high-speed fiber networks made __ 7__ new uses of broadband, he said. “No delay is very important,” he said, “specifically if you talk about __8__ that are time-dependent such as personal communications, conference calls or video calls where delays cause a lot of trouble.” While early FTTH services were __9__ in cities, said Mr. Helsen, many more were reaching out to rural areas for e-health and e-learning projects.
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【多选题】投影法可分为( )两大类
A.
中心投影法
B.
平行投影法
C.
正投影法
D.
斜投影法
【判断题】一体化产品必须作为一个系统来设计和开发,设计过程是“自顶向下”的,它的组件不能通过购买获得,需要自制,不能外包。
A.
正确
B.
错误
【判断题】电流互感器一二次侧都有熔断器保护,不需检验短路动稳定和热稳定。
A.
正确
B.
错误
【单选题】操作系统的【 】是指计算机系统中同时存在若干运行着的程序,这些程序交错执行。
A.
并发性
B.
共享性
C.
异步性
D.
虚拟性
【简答题】tRNA的三叶草型结构中,其中氨基酸臂的功能是____ __,反密码环的功能是___ _ _ 。
【单选题】操作系统中,“死锁”的概念是指
A.
程序死循环
B.
硬件发生故障
C.
两个或多个并发进程各自占有某种资源而又等待别的进程释放它们所占有的资源
D.
系统停止运行
【单选题】下列选项中对于操作系统的并发性描述不正确的是( )。
A.
它是指两个或两个以上的运行程序在同一时间间隔段内同时执行
B.
操作系统的并发性并不能改善系统资源的利用率
C.
发挥并发性能够消除计算机系统中部件和部件之间的相互等待
D.
它应该具有处理多个同时执行的程序的能力
【简答题】tRNA的三叶草型结构中,其中氨基酸臂的功能是__________,反密码环的功能是_________。
【简答题】投影法可分为( )投影法和( )投影法两大类,其中( )投影法又分为( )投影法和( )投影法,机械制图中广泛应用的是( )投影法。
【简答题】tRNA的三叶草型结构中,其中氨基酸臂的功能是(),反密码环的功能是()。
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