网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
The underwater listening system was originally designed ______.
A
to trace and locate enemy vessels
B
to monitor deep-sea volcanic eruptions
C
to study the movement of ocean currents
D
to replace the global radio communications network
参考答案
参考解析
解析：
细节题。第二段末句，水下声控系统，在过去几十年里建起来的用来追踪潜在敌人舰只的，只有A项合文意。
细节题。第二段末句，水下声控系统，在过去几十年里建起来的用来追踪潜在敌人舰只的，只有A项合文意。
更多 “单选题The underwater listening system was originally designed ______.A to trace and locate enemy vesselsB to monitor deep-sea volcanic eruptionsC to study the movement of ocean currentsD to replace the global radio communications network” 相关考题
考题
187. It is hard to track the blue whale, the ocean’s largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species. Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior. So biologists were delighted early this year when, with the help of the Navy, they were able to track a particular blue whale for 43 days, monitoring its sounds. This was possible because of the Navy’s formerly top-secret system of underwater listening devices spanning the oceans. Tracking whales is but one example of all exciting new world just opening to civilian scientists after the cold war as the Navy starts to share and partly uncover its global network of underwater listening system built over the decades to track the ships of potential enemies. Earth scientists announced at a news conference recently that they had used the system for closely monitoring a deep-sea volcanic eruption for the first time and that they plan similar studies. Other scientists have proposed to use the network for tracking ocean currents and measuring changes in ocean and global temperatures. The speed of sound in water is roughly one mile a second, slower than through land but faster than through air. What is most important, different layers of ocean water can act as channels for sounds, focusing them in the same way a stethoscope (听诊器) does when it carries faint noises from a patient’s chest to a doctor’s ear. This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles. [共5题](1) The passage is chiefly about ________.(A) an effort to protect an endangered marine species(B) the exposure of a US Navy top-secret weapon(C) the civilian use of a military detection system(D) a new way to look into the behavior. of blue whales(2) The underwater listening system was originally designed ________.(A) to monitor deep-sea volcanic eruptions(B) to replace the global radio communications network(C) to study the movement of ocean currents(D) to trace and locate enemy vessels(3) The deep-sea listening system makes use of ________.(A) the unique property of layers of ocean water in transmitting sound(B) the capability of sound to travel at hligh speed(C) low-frequency sounds travelling across different layers of water(D) the sophisticated technology of focusing sounds under water(4) It can be inferred from the passage that ________.(A) blue whales are no longer endangered with the use of the new listening system(B) new radio devices should be developed for tracking the endangered blue whales(C) military technology has great potential in civilian use(D) opinions differ as to whether civilian scientists should be allowed to use military technology(5) Which of the following is true about the US Navy underwater listening network?(A) It has been replaced by a more advanced system.(B) It is now partly accessible to civilian scientists.(C) It became useless to the military after the cold war.(D) It is indispensable in protecting endangered species.
考题
GPRS正确的的英文全称描述:()
A.Global Packet Radio ServiceB.General Packet Radio ServiceC.General Packet Radio SystemD.Global Packet Radio System
考题
Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and code Division Multiple Access (CMDA) .It is a ( ) information transfer mode.A.connection orientedB.connectionlessC.high bandwidth utilizationD.poor real-time
考题
●The (75)is designed specifically as a security system for preventing unauthorized communications between one computer network and another computer network.(75)A.firewallB.protocolC.hackerD.virus
考题
Circuit-switching technology is used in Public Switched Telephone Network（PSTN）, Global System for Mobile Communications（GSM） and Code Division Multiple Access（CDMA）. It is a （ ） information transfer mode.A.Connection oriented
B.connectionless
C.High bandwidth utilization
D.Poor-real-time
考题
GSM是以下哪个的简称（）A、Global System for Mobile communicationsB、Global Standard for Mobile cellularC、General Standard for Mobile cellularD、General System for Mobile communications
考题
GPRS的英文全称为（）A、Global.Packet.Radio.ServiceB、General.Packet.Radio.SystemC、General.Packet.Radio.ServiceD、Global.Packet.Radio.System
考题
Which phase includes the activity of assisting the customer to monitor their Cisco Unified Communications system performance and to respond to trouble reports（）A、MaintainB、DeployC、OperateD、Optimize
考题
Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and code Division Multiple Access (CMDA) . It is a ( ) information transfer mode.A、connection orientedB、connectionlessC、high bandwidth utilizationD、poor real-time
考题
GPRS的英文全称为（）A、Global Packet Radio ServiceB、General Packet Radio SystemC、General Packet Radio ServiceD、Global Packet Radio System
考题
GPRS正确的的英文全称描述：（）A、Global Packet Radio ServiceB、General Packet Radio ServiceC、General Packet Radio SystemD、Global Packet Radio System
考题
Cisco IDS sensors form the eyes and ears of your Cisco network intrusion detection system. Placing sensors correctly throughout your network is crucial to successfully implementing your Cisco intrusion detection system .Which two of these are characteristics of an IDS sensor？（）A、 has a permissive interface that is used to monitor networksB、 is an active device in the traffic pathC、 passively listens to network trafficD、 has a promiscuous interface that is used to monitor the network
考题
What are key benefits of IBM Systems Director Standard Edition?（）A、Backup data Manage problems Monitor network systemB、Report problems Manage servers and virtual environment Monitor the network C、Monitor system health and network Install and manage AIX and IBM i Manage energy consumption D、Monitor system health and network Manage servers and virtual environment Collect performance data
考题
You have a VPN server that runs Windows Server 2003 Service Pack 2 (SP2). You need to monitor the performance of the VPN server for one day. What should you do? （）A、From the Performance console, create a trace log.B、From the Performance console, create a counter log.C、Install Network Monitor Tools. From Network Monitor create a new capture.D、Install Network Monitor Tools. From Network Monitor create a new parser file.
考题
单选题The underwater listening system was originally designed ______.A
to trace and locate enemy vesselsB
to monitor deep-sea volcanic eruptionsC
to study the movement of ocean currentsD
to replace the global radio communications network
考题
单选题General radio communications in the global system may（）ship’s safety.A
be responsible forB
have an impact onC
commandD
give a guidance to
考题
单选题General radio communications in the global system are those between（）concerning the management and operation of the ships and may have impact on their safety.A
SAR party and the ship in distressB
SAR authorities and the ship in distress and survival craftC
A ship station and any coast stationD
Ship stations and shore-based communication network
考题
单选题You have a VPN server that runs Windows Server 2003 Service Pack 2 (SP2). You need to monitor the performance of the VPN server for one day. What should you do? （）A
From the Performance console, create a trace log.B
From the Performance console, create a counter log.C
Install Network Monitor Tools. From Network Monitor create a new capture.D
Install Network Monitor Tools. From Network Monitor create a new parser file.
考题
单选题Which phase includes the activity of assisting the customer to monitor their Cisco Unified Communications system performance and to respond to trouble reports（）A
MaintainB
DeployC
OperateD
Optimize
考题
单选题The deep-sea listening system makes use of ______.A
the sophisticated technology of focusing sounds under waterB
the capability of sound to travel at high speedC
the unique property of layers of ocean water in transmitting soundD
low-frequency sounds traveling across different layers of water
考题
单选题How long the haul for international deep-sea movement usually? （）A
Very longB
Ten thousands of milesC
Thousands of milesD
Thousands of kilometers
考题
单选题Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and code Division Multiple Access (CMDA) . It is a ( ) information transfer mode.A
connection orientedB
connectionlessC
high bandwidth utilizationD
poor real-time
考题
单选题What are key benefits of IBM Systems Director Standard Edition?（）A
Backup data Manage problems Monitor network systemB
Report problems Manage servers and virtual environment Monitor the network C
Monitor system health and network Install and manage AIX and IBM i Manage energy consumption D
Monitor system health and network Manage servers and virtual environment Collect performance data
考题
填空题GSM-R（Global System for Mobile Communications for Railway）是指（）。
热门标签
最新试卷