【简答题】一对标准安装的渐开线标准直齿圆柱齿轮外啮合传动,已知: a =100mm , z 1 =20 , z 2 =30 , α =20° , d a1 =88mm 。试计算下列几何尺寸: 1 齿轮的模数 m ; 2 两轮的分度圆直径 d 1 , d 2 ; 3 两轮的齿根圆直径 d f1 , d f2 ; 4 两轮的基圆直径 d b1 , d b2 ; 5 顶隙 C 。
threat 7 Who ’ s the ______ of the house ? 8. Terrorism is a ______ to the whole country. 9. We're in _______ with several other companies for the project . 10. We led a happy _______ as children. 11. I made my _______ to my host and left early. A. symbol B. symbolic C. symbolize 12. The pigeons _____ peace. 13. The lion is the _____ of courage. 14. They not only have _____ meanings. 15. A. harmony B. harmonious C. harmonize 和谐社会 a_______ society
【多选题】二、选词填空 (45%) A. competition B. owner C. apology
D.
existence
E.
threat 7 Who ’ s the ______ of the house ? 8. Terrorism is a ______ to the whole country. 9. We're in _______ with several other companies for the project . 10. We led a happy _______ as children. 11. I made my _______ to my host and left early. A. symbol B. symbolic C. symbolize 12. The pigeons _____ peace. 13. The lion is the _____ of courage. 14. They not only have _____ meanings. 15. A. harmony B. harmonious C. harmonize 和谐社会 a_______ society