【简答题】已知一正弦交流电流最大值是50A,频率为50Hz,初相位为120 0 ,则其解析式为 。
【简答题】已知一正弦交流电流i=6√2sin(314t+45°) A,则其最大值为_____,有效值为_____,角频率为_____,频率为_____,周期为_____,初相为______。
【单选题】It has been quite a long time _____ the two companies establishe a business relationship.
【简答题】已知一正弦交流电流i=6 sin(314t+45°)A,则其最大值为____________,有效值为_________,角频率为__________,频率为____________,周期为____________,初相为_____________。
【简答题】由于组成运动副中两构件之间的()形式不同,运动副分为高副和低副。A. 接触
【判断题】在化工生产中,空间速度越小,原料的转化率越高,选择性也越高。
【简答题】已知一正弦交流电流最大值是50A,频率为50Hz,初相位为120°,则其解析式为()A。
【单选题】A major reason for 【21】______ in the animal world is territory. The male animal establishes an area. The size of the area is sufficient to provide food for him, his 【22】______ and their offspring. Mig...