Ethernet 交换机是利用______进行数据交换的。A.端口/MAC 地址映射

题型:单项选择题

问题:

Ethernet 交换机是利用______进行数据交换的。

A.端口/MAC 地址映射表

B.IP 路由表

C.虚拟文件表

D.虚拟存储器

考点:计算机等级考试网络技术国家计算机三级(网络技术)82
题型:单项选择题

When can I get a cell phone?” The answer is when your parents think you need one, though many kids seem to be getting them around age 12 or 13. Some younger kids may have them because their parents see it as a matter of safety and convenience. For example, a kid can call mom and dad when sports practice is over. And a cell phone can give kids almost instant access(快捷通道) to their parents if something goes wrong or they need help. It can give parents quick access to their kids so they can check on them and make sure they’re OK.

If you do get a cell phone, make some rules with your parents, such as how many minutes you’re allowed to spend on the phone, when you can use your phone, when the phone must be turned off, and what you will do if someone calls you too often, and so on.

You’ll also have to learn to take care of the phone in your life. Keep it charged(充电) and store it in the safe place so it doesn’t get lost. And whatever you do, don’t use it in the bathroom. I know someone who dropped her phone in the toilet!

小题1:Parents buy cell phones for their kids because ___________.

A.they think it is necessary

B.they think their kids are old enough

C.they have asked the author for advice

D.they want to follow their kids wherever they are.小题2:The author of the passage ___________.

A.wants to describe how children use cell phones

B.knows nothing about when children can have a cell phone

C.may have done a survey on kids using cell phones

D.has been a teacher for many years小题3:Which of the following is true?

A.It is too young for kids of 12 or 13 to get a cell phone.

B.A cell phone is useful for kids and their parents.

C.The author is against the idea of kids to have cell phones.

D.Most kids are considering having cell phones.小题4:Who is the passage most probably written by?

A.Parents who have bought phones for their kids.

B.Someone who does cell phone business.

C.A teacher who cares most about school safety.

D.Someone who works for children’s education.小题5:Which might not be a rule for kids with a cell phone?

A.Keep it on all the time.

B.Make a call if something goes wrong.

C.Don’t use it in the bathroom.

D.Take care not to lose it.

题型:单项选择题

某溶液中含有CH3COO、SO42、SO32、HCO3、CO32等五种离子。将过量的Na2O2固体加入其中后,仍能大量存在的离子是                                             (   )

A.CH3COO、SO42、HCO3

B.SO42、SO32、CO32

C.SO32、HCO3

D.CH3COO、SO42、CO32

题型:单项选择题

某投资者以2.5元的价格买入30天到期的行权价为100元的看跌期权,以5元的价格买入30天到期的行权价为100元的看涨期权。30天后标的资产价格为110元,投资者可以获利多少元()。

A.2.5

B.0.5

C.2

D.1

题型:单项选择题

可转换证券的投资价值也称“内在价值”,指将可转换证券转股前的利息收入和转股时的转换价值按适当的必要收益率折算的现值。()

题型:单项选择题

无缝线路长轨条及缓冲区的钢轨联结采用接头夹板和普通螺栓。

更多题库