质硬而脆，易折断，断面不平坦，外层棕色而较粗糙，内层红棕色而油润，两层中间有1条黄棕色的线纹；粉末显微鉴别可见石细胞类圆形或类方形，油细胞类圆形或长圆形的是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='29383' and id < 2393458 and id<>'2393458' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29383' and id > 2393458 and id<>'2393458' order by id asc limit 5