【简答题】简单蒸馏的主要特点是________;简单蒸馏操作时易挥发组分的物料衡算式是________。
【单选题】一般反应器的设计中,哪一个方程式通常是不用的( ) A、反应动力学方程式 B、物料衡算式 C、热量衡算式 D、动量衡算式
【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 。
【单选题】已知一齿轮泵中,两渐开线直齿圆柱外齿轮为正常齿,传动比为3,小齿轮齿数为20,模数为3mm,中心距为125mm,则该齿轮传动为。 A. 标准直齿轮传动 B. 正角度变位齿轮传动 C. 高度变位齿轮传动 D. 负角度变位齿轮传动
【单选题】已知b,d,fs,不计凸轮与挺杆处摩擦,不计挺杆质量,若要挺杆不被卡住,a必须满足的条件( )。a=b/(2fs) B、ab/(2fs) D、任何a都不会卡住【图片】
【单选题】已知一齿轮泵中,两渐开线直齿圆柱外齿轮为正常齿,传动比为3,小齿轮齿数为20,模数为3mm,中心距为125mm,则该齿轮传动为 。
【多选题】A. competition B. owner C. apology
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
【判断题】堆积判弃的原则是只要发生堆积,就要丢弃,无论是峰堆积,还是尾堆积。
【多选题】二、选词填空 (45%) A. competition B. owner C. apology
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