三角形是最稳定的结构（1 / 2）

PmMvPA2CgOO3m+mXoumAuOSAneeLn+WYv+iavOSflOemreWMvO+GuuSYv+W5gueut+W5peU+Yzw+Yy88DYKA47Cz5YW35Ya65LCI5b6+6LaX5qWd5rqH5bm85aWf55qA6Zq85IC85YSa55q85J+U56at5aic5ZSw5qiA5o2n55m/6D5jPD5jLzwNgoDjhJrnvLHpuJHmpZ3mr5jmvYPplrvktoXlsrnlqJzlurrkqrjkgLjkuaXlhrrkpJnpmrjknL3khLvnj7DljLzvtK/ojbjkq4XlqZfmr5jmsbDlvJzngZ3ngLjkPmM8PmMvPA2CgOO9peWhneehsuaUueS2l+aMvO+PpueEmue6uuSapOWIvuWYieY+Yzw+Yy88DZ2A4oKA44qV5aic5Z+55KC95JyA4j5jPD5jLzwNgoDjpZ3mi7jktI3lt4bln4Dphb/os5/psKPlhJrnjJLlqbjmtpfmiZjli67lPmM8PmMvPA2CgOOSp+egh+W6m+Wdh+WUsOa6qec+Yzw+Yy88DYKA46ic5Zit5YSa57uW5baX5rCI5Ymn6J+v5bCc5Ymn6I6Q5aWf546Q5Y2J5pm/6LaX5omY5Yuu5T5jPD5jLzwNnYDin7zvhrrkn5znk73lmL/ooL3kjLzvsrfljIDona/olLDmhJrnkK3lqa3lj7DlnIDiPmM8PmMvPA2CgOORrOevj+WXvuWJp+i9v+WPgOU+Yzw+Yy88DYKA45+D54Sa546i56uF5bab6YO45Je+5b6i55a75Kui6K+U5qOC6bCI5am46LSN5Zaw5ZqE6Iy876eO5rGk5YyS5YG66KaE542n55m/6KOn6JO857OD5pa75Iy875GE6Kek5ZGQ5bqI5aO46bOA6ISa55CU6Zaw5ZCI5piP5ZS85oy8742k5Y2H6bm+6LOA6K2W5o245Kic5Z2v6ISa55S55LaX5j5jPD5jLzwNgoDjnq7li7rkqrjkmb/omqTltJvmmrzkupzmhJrnhKTluJvnrIvnlY3ltpfmiZjli67ljJLluaXljIfptJfptpfmta7mmb/ohJrnrrfluoflhrrkhqfovb/llrvkPmM8PmMvPA2CgOO+m+mEmue3huW/ueaim+WAuOSQiOaWjOWOueSgh+WtuOSXmuaRu+monOWMvO+dr+i5r+WEmuesu+SWu+SAneeskOW7luW2l+aMvO+AneePu+m2hOedvuS/uueGp+iEmueOkOWruug+Yzw+Yy88DZ2A4p+875eQ5b2l5Yi55IC75Ia65J+U55GP5ZGI5omv6IqR5Y2G5Ya65L2l5a6/5Iy877C16LG55KuI5Yy874Cd55Cd5Yq45JGP5Zmy5ruO5YC85ZOJ5pKt57WU54uJ5oqK5qC95Iy877iX6bWU566/5LuO5YiF5ZGI5pyA4pq874Cd57CF5omu5YO/5ZCA6Iy8772l5Y245IWD5oO/5a+Y5rml5ZO95aqP5baX5omY5Yuu5T5jPD5jLzwNgoDjm7rkmb/otK/otpfmiZjli67ljJLlvYPor4/ljbjkn7nkuaXljLzvh4nngLjkirPnirPnj7vpj7vptJfpv4XojLzvlZfnh4zmgJ3nsI3lmL/oirjksIXojLzvna/otK/oobLmlLnktpfmPmM8PmMvPA2CgOOul+m2l+aJmOWLruWdgOKfvO+GuuS2nua1kOWlk+WgveSMkuWcgOI+Yzw+Yy88DYKA44WD5qih6ISa56G35reG5b2u6KWu6Leg5o6A5q+Y5qic5bCO57mm5bmm5YuP5Yuc5oSa556u5YGA6Ke35Za55IyH6byc55a75Kic5aWd5qW75LSb54C45Kq45Jm/6IGn6Iuc572D6LGw5baX5omY5Yuu5Yy876+B54a65IC85Zye5oKm5T5jPD5jLzwNgoDju5bltpfmhaHokYzmrbvnp7vnqJzlmL/ouaXlPmM8PmMvPA2dgOKCgOOGuuS9peWxsOWlk+WRiOavmOagveScnuaCpuWcgOKavO+dr+ilj+WAuOS6h+WQkOWwnOWOmOaNuOSzkeWPhOaMvO+2l+aJmOWLruWAvOW+neaiheaiheaMvO+sveixueSbnee8nOeUueS2l+Y+Yzw+Yy88DYKA44a65KiK5bKG5T5jPD5jLzwNgoDjiZzmobLmvYPpu7Pns4XluYLngLjklrvkjJLlnq7ltoXlurrkhJrnjYnlop3phrrksK7omL/llrvkqa7ojrrks4fopbvkjLzvj4TmkaznhJrnjJLlqbjmt7XomL/noqLmiZznjLzvsIXmo6zmr5jmvYPptJfpjKHojIfpl63ljLzvsrrktojngYDohJrnlrvkkb/osrrkqIrlu7jkj4Tmv4TmjrrkiLvnv4Tls6XlhJrnn5zmhoDpm4/lqrjkj4PllrvkPmM8PmMvPA2CgOOGuuSNh+m0m+aUsOaZpumEmueCieWktuaXtOaMvO+9sea0sOaEmuelneaem+WmuOWinemWpOWOu+SJnOaYv+iKuOSruui2l+aJmOWLruWCgOOUueS2l+aEmue4uOWNj+WOuuStuOSGm+m9g+mbiuWPhOaos+aJnOaAieaMvO+onOWYreWEmue7luW2l+aJnOaYv+iwjueRj+WJnOahsuaoheWMruWWu+Q+Yzw+Yy88DZ2A4oKA44a65LiX6bO36K+Y5qWv6JS65Yy875WA5quI5Z+875eQ5ZWA5rOu5ZyA4j5jPD5jLzwNgoDji6LokYTohJrnlLnktpfmirjkuJHmjLzvlYTmioPmop3pobvmlrvkjLzvspjpio/ljbjknYznl77lsYrmq6LotpfmiZjli67lPmM8PmMvPA2dgOKfvO+GuuSIueSOgOagveSfvO+UueS2l+acgOInKD5jPA==