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fuel spray; the burning of the fuel the burned gas mixture; connecting rod medium shaft; crankshaft the burned gas mixture; piston rod
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turn away from people and opportunities expect difficulties and failure viewing everything by negative thinking think positively and expect success 68. Some people think that they have few friends in their lives perhaps because________. A. their thoughts are positive B. their thoughts are negative C. they avoid people and relationships D. destroy every opportunity to make friends 69. What does the author want to tell us in the fifth and sixth paragraphs? A. one has no reasons for his negative thinking and behavior B. one mustn’t always think about difficulties, failure and disasters C. one’s living environment has the decisive function upon his thinking D. one should never think of things happily and positively 70. From the passage we can learn that________. A. positive thinking has much to do with education and the environment one has been living in B. thinking negatively is much easier than thinking positively C. the moment you see something sad, you will feel sad too D. the positively we think and behave, the happier we will be
The mixture is too lean to burn The mixture is too rich to burn The vapor is about to explode Conditions are perfect for combustion
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believes regards influences memorizes
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thought having thought and to think thinking
thought having thought and to think thinking
possibility competence courage mixture
flammable vapor by volume in air oxygen present to support combustion the temperature of the flash point the lower limit of explosibility of the mixture
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the vapor air mixture is too rich to burn an explosion may occur if a source of ignition is present the vapor air mixture is too lean to bum the upper explosive limit has been exceeded
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Tasted Tasting Taste To taste
often usually always also
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