更多"[单选题]The TTL field was originally d"的相关试题:
[单选题]The TTL field was originally designed to hold a time stamp, which was decremented by each visited router. The datagram was ( ) when the value became zero. However, for this scheme, all the machines must have synchronized clocks and must know how long it takes for a datagram to go from one machine to another. Today, this field is used mostly to control the ( ) number of hops (routers) visited by the datagram. When a source host sends the datagram, it ( ) a number in this field. Each router that processes the datagram decrements this number by 1. If this value, after being decremented, is zero, the router discards the datagram.This field is needed because routing tables in the Internet can become corrupted.A datagram may travel between two or more routers for a long time without ever getting delivered to the ( ).This field limits the (请作答此空) of a datagram.
A.lifetime
B.moving time
C.receiving time
D.transmitting time
[判断题]TTL与非门电路开关速度快。
A.正确
B.错误
[单选题]下面( )不是三态TTL门的状态。
A.高电平状态
B.低电平状态
C.高阻状态
D.不固定状态
[单选题]HTL与TTL与非门相比，具有( )的特点。
A.HTL比TTL集成度高
B.HTL比TTL运行速度高
C.HTL比TTL抗干扰能力高
D.各种性能都一样
[单选题]下列不属于TTL与非门电路特点的是()。
A.开关速度较低
B.抗干扰能力较强
C.输出幅度大
D.带负载能力较强
[单选题]Text 3 Drones,originally developed for military purposes,weren't approved for commercial use in the United States until 2013.When that happened,it was immediately clear that they could be hugely useful to a whole host of industries-and almost as quickly,it became clear that regulation would be a problem.The new technology raised multiple safety and security issues,there was no consensus on who should write rules to mitigate those concems,and the knowledge needed to develop the rules didn't yet exist in many cases.In addition,the little flying robots made a lot of people nervous.Such regulatory,logistical,and social barriers to adopting novel products and services are very common.In fact,technology routinely surpasses society's ability to deal with it.That's partly because tech entrepreneurs are often insouciant about the legal and social issues their innovations birth.Although electric cars are subsidized by the federal govemment,Tesla has run afoul of state and local regulations because it bypasses conventional dealers to sell directly to consumers.Facebook is only now facing up to major regulatory concerns about its use of data,despite being massively successful with users and advertisers.It's clear that even as innovations bring unprecedented comfort and convenience,they also threaten old ways of regulating industries,running a business,and making a living.This has always been true.Thus early cars weren't allowed to go faster than horses,and some 19th-century textile workers used sledgehammers to attack the industrial machinery they feared would displace them.New technology can even upend social norms:Consider how dating apps have transformed the way people meet.Interestingly,the same institutional disorder that pervades nascent industries such as drones and driverless cars is something I've also seen in developing countries.And strange though this may sound,I believe that tech entrepreneurs can leam a lot from business people who have succeeded in the world's emerging markets.Entrepreneurs in Brazil or Nigeria know that it's pointless to wait for the govemment to provide the institutional and market infrastructure their businesses need,because that will simply take too long.They themselves must build support structures to compensate for what Krishna Palepu and I have referred to in earlier writrngs as"institutional voids."They must create the conditions that will allow them to create successful products or services.
Which of the following is true about drones?
A.It is under proper supervision.
B.It has multiple purposes.
C.It is opposed by people.
D.It has no security problem.
[单选题]TTL门电路输出高电平的典型值是（）。
A.1.2
B.2.4
C.3.6
D.4.8
[单选题]Which was NOT originally one of the Nobel Prizes?
A The medicine prize. B The literature prize. C The peace prize. D The economics prize.
A.A
B.B
C.C
D.D
