One of the largest battle of 17 th C.
十七世纪最大的战斗之一。
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。
Quite early. In the unearthed bones which date back to the 16 th B. C., the Chinese had been using the lunar calendar.
很早。在出土的16世纪前的骨头中，中国人就已经使用阴历了。
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。
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