A. white B. orange C. pencil D. pen E. green
Hi, I'm Lucy. I have a pencil box. It's ____ I have a ____ It's black. I have an eraser. It's ____ I have a ____ It's red. I have a crayon. It's____
下列各图中,属于内能转化为机械能的是( )
别人给你说生日快乐,你应该回答: