【判断题】制动蹄回位弹簧折断或弹力不够是制动拖滞的原因之一。
【单选题】某一级反应的半衰期为12min ,则36min后反应物浓度为原始浓度的
【单选题】Linda has made much _____ with her English and her parents are very happy about it.
【单选题】对于 NPN 型三极管,为实现电流放大,各极电位必须满足
【单选题】训练目标为增强耐力时,一般采取的运动方法为 ( )
B.
所给负荷必须达到能使肌肉较快产生疲劳的水平,即负荷量应相当大
【单选题】Miss Wang is very kind ______ her classes are very interesting. [ ]