单元测试九(国外英文资料).doc

单元测试九(国外英文资料) Unit test 9 unit test 9 · choice question. Which of the following torque performance is not ideal for turbo-charged diesel engines? () a. idle B. a low-speed segment C. medium section D. the high-speed period of Please choose the correct answer: A, B, C, D The ignition of the petrol engine belongs to () a. diffused combustion B. premix combustion C. the pressure is on fire The explosion burns at the same time Please choose the correct answer: A, B, C, D What is the 93 in gasoline? () a. octane B. antidetonating quality C. lead The sulfur content D. Please choose the correct answer: A, B, C, D Which of the following spray patterns can be achieved better by using pre-injection and multi-stage injection? () a. spray b. high pressure High pressure jet B. C. slow after the first sharp D. hurry before they are slow Please choose the correct answer: A, B, C, D One of the requirements for A reasonable diesel fuel injection is to reduce the fuel () a. injection pressure in the oil injection system B. jet flow C. to catch fire D. pressure fluctuations Please choose the correct answer: A, B, C, D The feedback control signals from the electric jet are derived from () A. oxygen sensor B. crank shaft position sensor Temperature sensor D. throttle position sensor Please choose the correct answer: A, B, C, D The harmful emission reduction of diesel engine pressurization technology is mainly () A.C O B.H C C.N Ox D. particles Please choose the correct answer: A, B, C, D When the excess air factor of the gasoline engine is in the air, the three catalysts can achieve a better purification effect on CO, HC and NOx. (a) A. 0.98 B. 0.998 C. 1.0 D. 1.02 Please choose the correct answer: A, B, C, D 9. Which of the following is more than double the power of four strokes? But as a result of thermal process and the organization structure in the design of the special problems, under the same working volume and speed, pme tend to reach the level of the four-stroke, rising power c