如题所述
åæ¯ç»å£ä»¤ä¼¼çãå ¶å®ï¼å¨6棱æ±ä¸,ä»»ä½ç¸é»ä¸¤ä¸ªä¾§é¢ç交线é½å«åã棱线ã,侧棱æçå°±æ¯æ£±çº¿ï¼å æ¤ä¾§æ£±å°±æ¯ä»»æ两个侧é¢ç交线ã