从用户的角度看,实现虚拟存储器后( )。A.提高了内存利用率 B.提高了存储速度

题型:单项选择题

问题:

从用户的角度看,实现虚拟存储器后( )。

A.提高了内存利用率

B.提高了存储速度

C.不再受内存实际容量的限制

D.需要用好的调度算法进行调出和装入

考点:计算机等级考试信息管理技术三级信息管理技术笔试97
题型:单项选择题

Electronics are being recycled in record numbers as more states require it and more companies collect and even pay for discarded items, but the gains come with controversy.

Some environmentalists complain that recycling is not keeping pace with electronics sales. Some say e-waste is being dumped in developing countries, where toxic materials such as lead and mercury can leach from landfills into groundwater.

"It is a success story, but we’d like to see it get more successful" to keep up with the electronics boom, says Janette Petersen of the Environmental Protection Agency (EPA). The amount of recycled items more than doubled from 1999 to 2007, the most recent year for which the EPA has figures. But as a percentage of all electronics, it increased less, from 15% to 18%. "The demand for electronics recycling has been growing," partly because of the switch last year to digital TV, says Jennifer Berry of Earth911. corn, a private group that keeps a database of recyclers. Last year, she says 31% of inquiries involved electronics, primarily TVs, batteries and computers.

Public and private efforts are expanding. Vermont became the 21st state last month to enact a law that requires e-waste recycling. Twenty-six companies--including Dell, Hewlett Packard, AT&T and Verizon--have partnered with the EPA on the Plug-In to eCycling program to promote electronics recycling since its launch in 2003. Companies such as Gazelle. corn pay for used gadgets such as iPods, which they resell or recycle. Best Buy and other stores are collecting more e-waste. Target announced last month that it put bins in every store to accept cellphones, MP3 players and ink cartridges.

Jim Puckett of Basel Action Network, a Seattle-based non-profit organization that aims to stop toxic exports, worries that some American companies dump e-waste in Africa to save money. "People are trying to look green, but they’re not telling you where it (waste) is going," he says. "You can’t turn over your TV to just any recycler. " He says it’s better to store an old TV than give it to a recycler that may export it to poor countries.

The Basel Action Network announced its e-Stewards program last month to ensure safe handling of electronics by using only recyclers certified by accredited organizations. It now lists 45 recyclers in 80 locations. Samsung and other companies have signed on. Environmental groups, including the Sierra Club, back it.

According to Jim Puckett, you cannot give your electronics to recyclers because ()

A. recyelers don’t tell you where the electronics will go

B. you may be cheated by recyclers for not knowing the electronics’ value

C. recyclers may export the electronics to poor countries

D. you can store your electronics for a better price

题型:单项选择题

毛果芸香碱临床用于

A.有机磷中毒

B.术后腹胀气

C.青光眼

D.扩瞳验光

E.抗休克

题型:单项选择题

在Windows中的文件的名字由主文件名与扩展名组成,其中扩展名用来反映文件的类型,因此每一个文件必须指定一个扩展名,没有扩展名的文件是非法的。

题型:单项选择题

AIDS的传播途径包括()。

A.性传播

B.经血传播

C.日常生活接触

D.经空气飞沫传播

E.母婴传播

题型:单项选择题

男,60岁,高血压病患者,目前血压为180/105mmHg,X线和心电图示左室肥大,尿常规示轻度蛋白尿,血肌酐正常。

[假设信息]应用降压药物治疗两周后,血压控制,出现腹胀,食欲不振,系由下列何种药物引起的可能性大()

A.双氢克尿噻

B.卡托普利

C.美托洛尔(倍他乐克)

D.甲基多巴

E.氨氯地平(络活喜)

更多题库