The book contains a series of graded exercises adapted to the use of beginners.
书中有一系列按难易排列的练习适于初学者应用。
Ham University pop - Ham University includes Morse Code lessons, graded exercises, and a game.
火腿弹出大学-咸大学包括摩尔斯电码的经验教训，分级练习，和游戏。
Federal Graded Exercises : Grammar provides abundant practice, in easily manageable review exercises, for students to consolidate the language structures they have learned.
《联邦英文进阶练习》共计六册，是特别为亚洲人编写的文法练习，由浅入深，能加强学生对英语结构的了解与运用。
应用推荐