Question: what fleet is associated with the number L4?
SQL: SELECT "Fleet" FROM "2-10684273-1" WHERE "Number" = 'L4';

Question: what number is associated with the Baltic fleet and Leninets (Ленинец)?
SQL: SELECT "Number" FROM "2-10684273-1" WHERE "Fleet" = 'Baltic' AND "Name" = 'Leninets (Ленинец)';

Question: when was Garibaldets (Гарибальдиец) launched?
SQL: SELECT "Launched" FROM "2-10684273-1" WHERE "Name" = 'Garibaldets (Гарибальдиец)';

Question: when was the number L6, with a fleet of Black Sea, launched?
SQL: SELECT "Launched" FROM "2-10684273-1" WHERE "Fleet" = 'Black Sea' AND "Number" = 'L6';

Question: what number is associated with the name Chartist (Чартист)?
SQL: SELECT "Number" FROM "2-10684273-1" WHERE "Name" = 'Chartist (Чартист)';