【简答题】array_search ()函数的作用是什么?
【单选题】-Where are you going to work next year? -_______ Maybe Hefei or Nanjing. [ ]
【单选题】三相感应电机的转差率 4,此时为( )运行状态。
【简答题】现行公路规范中汽车荷载包括:( )和( )两种;按荷载大小汽车荷载分为:( )和 ( )两个级别。
【简答题】★一台三相八极感应电动机的电网频率,空载运行时转速为735转/分,此时转差率为 ,转子电势的频率为 。当转差率为0.04时,转子的转速为 ,转子的电势频率为 。
[填空(1)][填空(2)] [填空(3)] [填空(4)]
【判断题】生殖隔离的产生是判断物种形成的依据和标准。
【单选题】-Where are you going to work next year? -_______ Maybe Hefei or Nanjing. [ ]
【单选题】- Are you happy to have the two-month summer holiday? -Sure. We can relax ourselves and do many things we like.
【简答题】现行公路桥涵设计规范中,汽车荷载包括 和 两种。