猪蹄怎么区别前后蹄？挑选时牢记这“2点”，下次买肉别再买错了

SQL Error: select id,classid,ttid,onclick,plnum,totaldown,newspath,filename,userid,username,firsttitle,isgood,ispic,istop,isqf,ismember,isurl,truetime,lastdotime,havehtml,groupid,userfen,titlefont,titleurl,stb,fstb,restb,keyboard,title,ftitle,bigpic,newstime,titlepic,smalltext,diggtop from ***_ecms_news where (classid='20') and ispic=1 order by onclick desc limit 1 SQL Error: select id,classid,ttid,onclick,plnum,totaldown,newspath,filename,userid,username,firsttitle,isgood,ispic,istop,isqf,ismember,isurl,truetime,lastdotime,havehtml,groupid,userfen,titlefont,titleurl,stb,fstb,restb,keyboard,title,ftitle,bigpic,newstime,titlepic,smalltext,diggtop from ***_ecms_news where (classid='20') and ispic=1 order by onclick desc limit 6,1 SQL Error: select id,classid,ttid,onclick,plnum,totaldown,newspath,filename,userid,username,firsttitle,isgood,ispic,istop,isqf,ismember,isurl,truetime,lastdotime,havehtml,groupid,userfen,titlefont,titleurl,stb,fstb,restb,keyboard,title,ftitle,bigpic,newstime,titlepic,smalltext,diggtop from ***_ecms_news where (classid='20') and ispic=1 order by onclick desc limit 7,1 SQL Error: select id,classid,ttid,onclick,plnum,totaldown,newspath,filename,userid,username,firsttitle,isgood,ispic,istop,isqf,ismember,isurl,truetime,lastdotime,havehtml,groupid,userfen,titlefont,titleurl,stb,fstb,restb,keyboard,title,ftitle,bigpic,newstime,titlepic,smalltext,diggtop from ***_ecms_news where (classid='20') and ispic=1 order by onclick desc limit 14,1