使用top命令查看cpu使用情况，us为用户进程所消耗的cpu时间,sy为内核消耗的cpu时间，一般来说us+sy之和小于多少，系统运行状态是良好的（)

A.ps

B.fdisk

C.uptime

D.top

A.free这列表示空闲的物理内存的大小

B.swpd这列表示虚拟内存已使用的大小，如果大于0，表示你的机器物理内存不足了

C.in这列表示每秒CPU的中断次数，包括时间中断

D.cs这列表示每秒上下文切换次数

阅读材料，回答题：

American Dreams

There is a common response to America among foreign writers:the US is a land of extremes where the best of things are just as easily found as the worst. This is a cliche(陈词滥调).

In the land of black and white, people should not be too surprised to find some of the biggest gaps between the rich and the poor in the world. But the American Dream offers a way out to everyone.______ .(46) No class system or government stands in the way.

Sadly, this old argument is no longer true. Over the past few decades there has been a fundamental shift in the structure of the American economy.

The gap between the rich and the poor has widened and widened.________ (47)

Over the past 25 years the median US family income has gone up 18 per cent. For the top 1 percent, however, it has gone up 200 per cent. Twenty-five years ago the top fifth of Americans had an average income 6.7 times that of the bottom fifth. ________ (48)

Inequalities have grown worse in different regions. In California, incomes for lower class families have fallen by 4 per cent since 1969. ________ (49) This has led to an economy hugely in favor of a small group of very rich Americans. The wealthiest 1 per cent of households now control a third of the national wealth. There are now 37 million Americans living in poverty. At 12.7 percent of the population, it is the highest percentage in the developed world.

Yet the tax burden on America&39;s rich is falling, not growing. ________ (50) There was an economic theory holding that the rich spending more would benefit everyone as a whole. But clearly that theory has not worked in reality.

A．Nobody is poor in the US.

B．The top 0.01 per cent of households has seen its tax bite fall by a full 25 percentage pointssince 1980.

C．For upper class families they have risen 41 per cent.

D．Now it is 9.8 times.

E．As it does so, the possibility to cross that gap gets smaller and smaller.

F．All one has to do is to work hard and climb the ladder towards the top.

回答（46）题 查看材料

A.A

B.B

C.C

D.D

E.E

F.F

根据以下材料，回答题

American Dreams

There is a common response to America among foreign writers: the US is a land of extremes where the best of things are just as easily found as the worst. This is a cliche （陈词滥调）.

In the land of black and white， people should not be too surprised to find some of the biggest gaps between the rich and the poor in the world. But the American Dream offers a way out to everyone. __________ （46） No class system or government stands in the way.

Sadly， this old argument is no longer true. Over the past few decades there has been a fundamental shift in the structure of the American economy.

The gap between the rich and the poor has widened and widened. __________ （47）Over the past 25 years the median US family income has gone up 18 percent. For the top 1 per cent， however， it has gone up 200 percent.Twenty-five years ago the top fifth of Americans had an average income 6.7 times that of the bottom fifth. __________ （48）

Inequalities have grown worse in different regions.In California， incomes for lower class families have fallen by 4 percent since 1969. __________ （49） This has led to an economy hugely in favor of a small group of very rich Americans.The wealthiest 1 per cent of households now control a third of the national wealth.There are now 37 million Americans living in poverty.At 12.7 percent of the population， it is the highest percentage in the developed world.

Yet the tax burden on America"s rich is falling， not growing. __________ （50） There was an economic theory holding that the rich spending more would benefit everyone as a whole.But clearly that theory has not worked in reality.

回答（46）题 查看材料

A.Nobody is poor in the US.

B.The top 0.01 percent of households has seen its tax bite fall by a full 25 percentage points since 1980.

C.For upper class families they have risen 41 percent.

D.Now it is 9.8 times.

E.As it does so， the possibility to cross that gap gets smaller and smaller.

F.All one has to do is to work hard and climb the ladder towards the top.

A.花费总结

B.所有这些

C.按服务划分的每月最新支出

D.按支出划分的月度最新服务

A．Because British companies are more ambitious than US companies.

B．Because British companies place more importance on PR than US companies.

C．Because British companies are heavily involved in planning activities.

D．Because four of the world's top PR agencies are British-owned.

A.在检查组播转发表信息时,可通过执行display multicast forwarding-table命令来查看二层组播转发表项

B.在检查防攻击检测配置时,可通过执行display current-configuration丨 include car命令,应该有防攻击的配置。如果未配置,可使用car命令为设备配置防攻击功能

C.在检查组播路由协议时,可通过执行display multicast routing-table命令来查看组播路由表。如果域内组播踣由协议采用PIM-SM,那么与组播相连的接口都不需要使能IGMP

D.在检查VRRP状态时,可通过执行display vrrp和 display vrrp statistics命令进行查看,“State”应为“Initialize”状态

A.ipconfig

B.ipcontig

C.ipcanfig

D.ipconnfig

A.Ping

B.Ipcofig

C.nslookup

D.Winipcfg

e their emissions pledges transparent to outsiders and that the Obama administration isn't ready to follow Europe's lead in specifying how much money rich nations should contribute over the next decade to help poor countries respond to climate change.