These figures began to appear during the 15 th century B. C. in Mycenaean sanctuaries and tombs.
这些数字开始出现在15世纪迈锡尼保护区和墓葬年代。
It is obvious th at A. C. motors are superior to D. C. motors in many appli cations.
显然,交流电机在许多应用场合比直流电机优越。
It is obvious th at A. C. motors are superior to D. C. motors in many appli cations.
显然,交流电机在许多应用场合比直流电机优越。
应用推荐