..Can you help me 物距【u】：物体到透镜的距离焦距【f】：光心到焦点的距离焦距×2【2f】：2倍光心到焦点的距离这个我知道..主要这个表格我还是不明白...物距与焦距的关系:u>2f 2f>u>f u

CAN YOU HELP ME help me,can you you can help me? Can you help me? Can you help me __it? Can you help me?的同义句 Can you ( ) me ( ) ( i can help you .but ,who can help me Can you help me?(肯定回答)是什么? Can you help me ( )my English,Mary. can you help me out here?不懂 can you help me with ____(dance) can you help me find the Clean the room can you help me can you help me with 英语 Can you help me learn English well? can you help me,please?的答句速回 Can you help me?速度好评哦! Can you help me?改为同义词?