题目内容
曲轴箱窜气的主要成分是HC和CO。
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燃油蒸气的主要有害成分是HC。
EGR系统在各种工况都工作。
EGR系统工作时,会使发动机功率下降。
Directions:This partis to testyour listening ability. It consists of 3 sections.Section ADirections: This section is to test your ability to give proper response. There are 5 recordedquestions in it. After each question, there is a pause. The questions willbe readtwice. When you hear a question, you should decide on the correctanswer from the4 choices marked A, B, C and D.Which one is the correct answer?
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