请é®é²éç¼å¨å¹³é¢å¾ä¸æä¹è¡¨ç¤ºï¼æ¯å¨å»ºçæ½å·¥å¾è¿æ¯å¨ç»ææ½å·¥å¾ä¸è¡¨ç¤ºï¼å¹³é¢å¾ä¸ï¼é²éç¼ä¸¤ä¾§çæ¢ãæ±æ¯ç»ä¸¤æ¡ç¸é»ç轴线åï¼
åçï¼å»ºçä¸ä¹¦é¢è¯åºå½ä¸ºä¼¸ç¼©ç¼ææ²éç¼ï¼å¨å¹³é¢å¾ä¸ç¨ä¸¤æ¡å®çº¿è¡¨ç¤ºç¼å®½ï¼
建æ½å¾åç»æ½å¾é½æ¯ç¨ä¸¤æ¡å®çº¿è¡¨ç¤ºç¼å®½çï¼
伸缩ç¼ä¸¤ä¾§çæ¢ãæ±è½´çº¿ä¸ºå¹³è¡äºä¼¸ç¼©ç¼ç两æ¡ç¸é»è½´çº¿ï¼è½´çº¿å¤å¹¶å 设äºä¸¤ä¸ªè½´å·ã
追é®ä¼¸ç¼©ç¼ãæ²éç¼ãé²éç¼æ¯åå½¢ç¼ã
追çæ¯çï¼