【判断题】HXD3C型电力机车避雷器F3属于车内避雷器,型号为YH10WT-43/108BN,串联)于主断路器和高压原边电流传感器之间,它主要抑制主断路器开闭时产生的操作过电压,避免对机车内部的控制电器产生过电压侵害。
【单选题】—Is this computer ______, Mike? —No, it's not mine. I think it's ______. [ ]
【单选题】单手肩上投篮将球投出时,使肘关节伸的肌肉有:( )。
【简答题】DDR400内存的物理工作频率为( )。
【单选题】Taking the train across town is quicker than taking the bus. Taking the bus across town is slower than driving a car. Therefore, taking the train across town is quicker than driving a car.
【单选题】Mary sits ______ Mike and Lily. [ ]
【单选题】不属于潜污泵操作前准备工作是()。
A.
开机前检查泵站内是否有较大的固态杂质,如有则需及时清除以避免泵的损坏
B.
若排污泵或控制箱检修过,在起动之前还应检查电源电压是否与电机铭牌上标注的电源电压是否一致
【单选题】Not until he retired from teaching three yeas ago ________ having a holiday abroad.