ããæ¹æ³ä¸ã
ããéä¸æåï¼ç¹å»æ ¼å¼å·¥å ·æ ä¸çä¸å线æé®å³å¯ãéåå¤å°æåä¸å线就æå¤é¿ã
ããæ¹æ³äº
ãã1ãéä¸æåï¼ä¾æ¬¡ç¹å»âæ ¼å¼âï¼âè¾¹æ¡ååºçº¹âï¼
ãã2ãç¹å»âè¾¹æ¡âï¼âèªå®ä¹âï¼éæ©â线åâï¼é»è®¤ä¹å¯ï¼ï¼åºç¨äºâ段è½âãå¨é¢è§çªå£ï¼ç¹å»ä¸è¾¹æ¡ã
ãã3ãç¡®å®éåºå³å¯ãè¿æ ·è®¾ç½®çä¸å线æ¯å¨æ®µè½ä¸é¢æä¸æ¡é¿è¾¾æ´è¡ç线ã