请问加拿大的签证分为几种

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select * from tbl_Articles WHERE ArticleID=2533974 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2533974 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2533974 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1087926,1096817,1090260,1118915,1126577,1097351,1066020,1114000,1105605,1091061,1056976,1115463,1085390,1098893,1115501,1110658,1110546,1114456,1092139,1099791,1062566,1055718,1115077,1099819,1080428,1102328,1095520,1111448,1087912,1092308) ORDER BY field (ArticleID,1087926,1096817,1090260,1118915,1126577,1097351,1066020,1114000,1105605,1091061,1056976,1115463,1085390,1098893,1115501,1110658,1110546,1114456,1092139,1099791,1062566,1055718,1115077,1099819,1080428,1102328,1095520,1111448,1087912,1092308)