【简答题】相交于一个顶点的三条棱相等的长方体一定是正方体.______.(判断对错)
【简答题】唐代诗人白居易游览庐山香炉峰大林寺时题诗《大林寺桃花》:“人间四月芳菲尽,山寺桃花始盛开。长恨春归无觅处,不知转入此中来。”庐山既是我国著名的旅游胜地,又是我国的世界文化遗产。据此回答1~2题。 1.家住重庆的一位退休教师欲乘火车到庐山旅游,距离最短的乘车路线是 [ ] A.襄渝线—焦柳线—湘黔线—浙赣线—京九线 B.成昆线—宝成线—陇海线—京九线 C.川黔线—黔桂线—湘桂线—京广线—浙赣...
【简答题】(face)with so many challenges , Yang Guang , a blind young fellow, didn't give up; he made his greatest efforts to win success.
【简答题】《大林寺桃花》的作者是_____________
【单选题】我国工频交流电的频率为50Hz,其周期为
【简答题】我国的 工频 为( )Hz,其周期为 ( ) S,角频率为 ( ) rad/s。
【单选题】_________ Yang Guang is blind, he has made his great dream come true by his hard work.
【判断题】我国的工业频率为50Hz,其周期为0.02s。