作图题(保留痕迹,不写作法):如图,在10×5的正方形网格中,每个小正方形边长均为单位1,将△ABC向右平移4个单位,得到△A 1 B 1 C 1 ,再把△A 1 B 1 C 1 绕点A 1 按逆时针方向旋转90°得到△A 2 B 2 C 2 ,请画出△A 1 B 1 C 1 和△A 2 B 2 C 2 .
【单选题】Man is a land animal, but he is also closely tied to the sea. Throughout history the sea has served the needs of man. The sea has provided man with food and a convenient way to travel to many parts of...
【单选题】Man is a land animal, but he is also closely tied to the sea. Throughout history the sea has served the needs of man. The sea has provided man with food and a convenient way to travel to many parts of...