var sources_list=[]; var source_id=[]; source_id[0]=0; sources_list.push({image:"https://file.yijiaowang.com/upload_file/vodfile/202003/04/0_92532_1583329182_792.jpg",sources:[{file: "video_file.m3u8?id=509:0_92532_1583329182_792:1&7427"}],title:"多元复合函数求偏导数"}); source_id[1]=1; sources_list.push({image:"https://file.yijiaowang.com/upload_file/vodfile/202003/08/0_92532_1583658276_251.jpg",sources:[{file: "video_file.m3u8?id=511:0_92532_1583658276_251:1&1829"}],title:"多元复合函数求导综合题"}); source_id[2]=2; sources_list.push({image:"https://file.yijiaowang.com/upload_file/vodfile/202003/26/0_92532_1585228346_764.jpg",sources:[{file: "video_file.m3u8?id=639:0_92532_1585228346_764:1&380"}],title:"二重积分的性质"}); var ret_str; var sources_flag=1; var source_num=sources_list.length; var content=''; var flag_arr=[]; var file_id=0; var contenta=''; flag_arr[509]=1; contenta+='收藏'; file_id=509; content+='
多元复合函数求偏导数
'; content+='录播 7分33秒免费'; content+=contenta; content+='
'; content+='多元复合函数求导综合题
'; content+='录播 5分57秒免费'; content+=contenta; content+='
'; content+='二重积分的性质
'; content+='录播 7分30秒1.00元'; content+=contenta; content+='
'; content+='