temperature sensors

第一组

An automatic system usually consists of a control system and an information system. A control system is a system which measures the condition of some entity and, with the information, governs the state of a variable; i.e., speed, temperature, pressure, position, etc. The open-loop system is the simplest form. a control system may assume. It is distinguished from the closed-loop system by the lack of an input which measures the state of the controlled variable; such an input is called a feedback. In modern ships the open-loop system has practically disappeared and the closed-loop system which operates with a feed-back is extensively used. An information system serves the parallel function of monitoring system or plant performance. The monitoring function may serve a number of purposes; specifically it may indicate values of controlled variables to guide remote control operations, warn of off-limit conditions and provide record of performance. In many cases a visual and audible alarm may be provided to warn of off-limit conditions on board ship and, associated with this, the important variables will be recorded on demand. The automatic control system can be more sophisticated by incorporating digital-processing equipment, that is, a computer. This computer is usually fed with signals from all sensors. It scans the values of the sensors and generates alarm signals for off-limit conditions, acting as a super-supervisor. Sometimes, it can even make necessary and take the necessary action to optimize performance without human intervention.

The closed-loop system differs from the open-loop system by

A.the lack of a feedback

B.the presence of a feed back

C.the lack of a computer

D.the presence of a computer

fast that we seldom stop to see just how fast we seldom stop to see just how far wu have come in just a few year.The latest iPone 6s,for example,has a dual-core proccssor and fite nicely into your pocket. by comparison, you would expect to find a technological specification like this on your tandard laptop in an office anywhere in the world. its no wonder shat new applications for the internet of things are moving ahcad fast when almost every new decice we buy has a plup on the eng of it or a wireless connection to the internet. Soon, our current smartphone lifestyle wilate our own smart home lifestyle too. All researches agree that close to 25 billion devices,things and sensors will be connected by 2020 which incidentally is also the moment that millennials(千禧一代) are expected to make up of our overall workforce, and the fully connected home . become a reality for large umbers of people worldwide. However this is just the tip of the proverbial iceberg as smart buildings and even cities increasingly become the norm as leaders and business owners begin to wake up to the massive savings that technology can deliver through connected sensors and new forms of automation coupled with ligent energy and facilities managemen. Online security cameras, intelligent lighting and a wealth of sensors that control both temperature and air quality are offering an unprecedented level of control, efficiency, and improvements to hat were once classed necessary costs when running a business or managing a large building. We can expect that the ever-growing list of devices, systems and environments remain connected,always online and talking to each other. the big benefit will not only be in the housing of this enormous and rapidly growing amount of data, but will also be in the ability to run real time data analytics to extract actionable and ongoing knowledge. The biggest and most exciting challenge of this technology is how to creatively leverage this ever-growing amount of data to deliver cost savings, improvements and tangible benefits to both businesses and citizens of these smart cities The good news is that most of this technology is already invented. let's face it, it wasn't too long ago that the idea of working from anywhere and at anytime was some form of a distant utopim(乌托邦式的) dream, and yet now we can perform almost any office-based task from any location in the world as long as we have access to the internet. it's time to wake up to the fact that making smart buildings, cities and homes will dramatically improve our quality of life in the years ahead. What does the example of iphone 6s serve to show？A.the huge capacity of the smartphones people now use

B.the widespread use of smartphones all over the world

C.the huge impact of new technology on people's everyday life.

D.the rapid technological progress in a very short period of time

what can we expect to see by the year 2020？A.apps for the internet of things

B.the emergence of millennials

C.the popularization of smart homes.

D.total globalization of the world

what is the most exciting challenge when we possess more and more data？A.how to turn it to profitable use

B.how to link the actionable systems

C.how to do real time data analysis

D.how to devise new ways to store it.

what does the author think about working from anywhere and at anytime？A.it is feasible with a connection to the internet

B.it will thrive in smart buildings, cities and homes

C.it is still a distant utopian dream for ordinary workers

D.it will deliver tangible benefits to both boss and worker

what will business owners do when they become aware of the benefits of the internet of things？A.employ fewer workers in their operations

B.gain automatic control of their businesse

C.invest in more smart buildings and cities

D.embrace whatever new technology there is

请帮忙给出每个问题的正确答案和分析，谢谢！

A.A.Stabilizer position sensors A

B.B.Stabilizer position sensors B

C.C.A+B

D.D.以上都不是

A.urrent sensors （电流传感器）

B.position sensors （位置传感器）

C.NOx sensors （氮氧传感器）

D.RPM sensors （转速传感器）

monly known as Megalodon, is believed to have lived between I million and 5 million years ago and thought to have been 52 feet long. It is (or was) a shark that had a jaw 7 or more feet wide. Fairly recently, there has been some speculation about whether it is extinct or just out of reach. But few people believe that Megalodon has found a home deep in the ocean.

There are many known "Living Fossils": Coelacanth, Sea Cucumbers, Sea Urchins, Lobsters, Sea Stars. The common ones like lobsters and sea urchins are not really looked on as anything amazing. They've been around for thousands of years or more, and axe easily accessible to us. What if they weren't accessible and yet still existed？ We would label them extinct. The discovery of a live Coelacanth, a fish long believed extinct, challenged some scientists' long-held beliefs on extinction. There have been recent discoveries Of incredibly large squid, and deep-sea fish never before seen by scientists.

In the 1960s the U.S. Navy set up underwater microphones around the world to track Soviet submarines. The network, known as the Sound Surveillance System, still lies deep below the ocean's surface in a layer of water known as the "deep sound channel'. The temperature and pressure of the channel allow sound waves to travel undisturbed. NOAA's Acoustic Monitoring Project has been using the Sound Surveillance System to listen for changes in ocean structure like ocean currents or volcanic activity. Most of the sounds recorded are common and of no concern. One sound, identified in 1977 by U.S. Navy "spy" sensors, was odd. It was obviously a marine animal but the call was more powerful than any of the calls made by any other reported sea creature. It was too big for a whale. Could it be a deep-sea monster？ One possibility was a giant squid, but no one is sure. It was named "Bloop". Could it be Megalodon？ If Megalodon is still alive down in the bottom of the ocean, we may some day soon discover it. Then what？ Deep sea diving will never be the same, that's for sure!

The following is commonly known EXCEPT ________.

A．Megalodon, the largest shark, is extinct

B．Megalodon is not extinct but just out of reach

C．Megalodon was 52 feet long and had a jaw 7 or more feet wide

D．Megalodnn lived between several million years ago

A.刚体(Body)

B.传感器(Sensors)

C.机架(Ground)

D.机械环境(MachineEnviroment)

A.传感器(sensors)技术

B.无线射频识别(radio frequency identification, RFID)技术

C.指示剂(indicators)技术

D.二维码技术

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 networks

B. is an active device in the traffic path

C. passively listens to network traffic

D. has a promiscuous interface that is used to monitor the network