Read the answer to "Why did the Malaysian Airlines flight lose contact?"

Why did the Malaysian Airlines flight lose contact? Read the answers

Read the following passage and answer questions 29-33. (Please use a 0.5mm black pen to write your answer in the designated position on the answer sheet. ***15 points)

Why did the Malaysian Airlines passenger plane lose contact

⑴Malaysian Airlines MH370 The missing flight incident and the resulting global search operation attracted worldwide attention and affected people's hearts. Under modern technological conditions, why would an advanced passenger aircraft suddenly lose contact? To understand why, we must first start with how the aircraft maintains contact with the ground.

⑵ Under normal circumstances, aircraft will maintain contact with the ground through a variety of radio communication systems. Take the Boeing 777 as an example. This advanced passenger aircraft has three independently operating radio communication systems to maintain contact with the ground. Among them, the high-frequency communication system is a long-distance communication system, and the communication distance can reach thousands of kilometers. Short-range VHF communication systems are the most commonly used, with a range of 74 kilometers at an altitude of 300 meters. Read the answer to "Why did the Malaysian Airlines plane lose contact?" Because takeoff and landing are the times when the aircraft and the ground are most frequently contacted, and are also the times when accidents are most likely to occur during flight, so in order to ensure the high reliability of the VHF communication system, civil aviation aircraft Generally, more than one radio communication system is installed.

⑶Ground control radar is also one of the ways for controllers to obtain aircraft position information. Control radar is divided into primary surveillance radar and secondary surveillance radar. A surveillance radar obtains echoes through scanning, and the small light spots displayed on the screen are aircraft in the sky. The secondary surveillance radar will transmit interrogation pulses to aircraft in the air. After receiving the interrogation pulses, the airborne transponder will compile the transponder code and altitude, speed and other information into a response pulse and send it back to the ground. The information obtained by the secondary radar is combined with the aircraft position information obtained by the primary radar to form comprehensive information that is finally displayed on the terminal of the ground controller and maintains contact with the aircraft through this information.

⑷In addition to maintaining contact with the ground through the radio communication system and ground control radar, the aircraft also maintains contact with the ground through the ACARS system. The ACARS system is the most important means of monitoring aircraft flight status on the ground. The ground control center can understand the aircraft's engine, altitude, heading and other data at any time.

⑸If an aircraft cannot make VHF radio calls, cannot scan the primary radar, does not answer secondary radar inquiries, or even the ACARS system is turned off, then the aircraft will be in contact with the ground control system. Completely lost contact.

⑹ From a technical point of view, the disappearance of the passenger plane is closely related to the difficulty of grasping the actual position of the aircraft with existing air traffic control technology that mainly relies on ground radar. ADS-B air traffic control technology, known as the next generation of air traffic control technology, was actually developed more than 10 years ago. The delay in its popularization is not due to technical reasons, but due to the need to monitor all current air traffic control systems. The ground and air equipment must be updated, and all air traffic controllers and pilots need to be retrained. The difficulty can be imagined. I wonder if the missing Malaysia Airlines incident will be a catalyst for a new generation of air traffic control technology to come to the forefront.

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29. What is the function of paragraph 1 of the selected text? (3 points)

30. The underlined sentence in paragraph (2) "Take the Boeing 777 as an example. This advanced passenger aircraft has three independently operating radio communication systems to maintain contact with the ground." What is used? Explain the method? What is the function? (4 points)

31. Can the word "one" added in paragraph ⑶ be deleted? Why? (3 points)

32. Read paragraph 4 of the selected article and find out three ways for the aircraft to maintain contact with the ground. (3 points)

33. Based on the content of paragraph ⑹ of the selected article, please talk about the missing Malaysia Airlines incident. Can it be a booster for the new generation of air traffic control technology to come to the forefront? (2 points)

29. Stimulate readers’ interest in reading; (1 point) introduce (or explain) the explanatory object of this article; (1 point) elicit the explanatory content below. (1 point)

30. Give examples and list numbers. (2 points) Specifically and accurately explains that under normal circumstances, aircraft will maintain contact with the ground through a variety of radio communication systems. (2 points)

32. Radio communication system, ground control radar, ACARS system. (3 points)

33. Just make sense and speak fluently.

(2 points)

Example 1: No, because the promotion of the new generation of air traffic control technology requires the ground and air equipment of all current air traffic control systems)

31. Cannot be deleted. (1 point) "One" has a restrictive effect, indicating that ground control radar is a way for controllers to obtain aircraft position information, not the only way. (1 point) It is not realistic after deletion. This word reflects the explanatory text The scientific nature, accuracy and rigor of the language. (1 point) Update, all air traffic controllers and pilots need to be retrained, the difficulty can be imagined.

Example 2: Yes, the new generation of air traffic control technology was developed more than 10 years ago. Although its promotion has encountered difficulties, the missing Malaysia Airlines incident will definitely wake people up and make new A new generation of air traffic control technology comes to the fore.

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