Question: what is the sum of tonnage when the type of ship is Twin Screw Ro-Ro Motorship and the date entered service is 11 February 1983?
SQL: SELECT SUM("Tonnage") FROM "2-11662133-3" WHERE "Type of Ship" = 'Twin Screw Ro-Ro Motorship' AND "Date entered service" = '11 February 1983';

Question: what is the ships name that is a Twin Screw Ro-Ro Motorship and entered service on 11 February 1983?
SQL: SELECT "Ship's name" FROM "2-11662133-3" WHERE "Type of Ship" = 'Twin Screw Ro-Ro Motorship' AND "Date entered service" = '11 February 1983';

Question: what is the least tonnage for the ship(s) that entered service on 11 February 1983?
SQL: SELECT MIN("Tonnage") FROM "2-11662133-3" WHERE "Date entered service" = '11 February 1983';

Question: what is the name of the ship that was withdrawn from service on 25 March 1986?
SQL: SELECT "Ship's name" FROM "2-11662133-3" WHERE "Date withdrawn" = '25 March 1986';

Question: what is the tonnage of the ship Koningin Juliana?
SQL: SELECT "Tonnage" FROM "2-11662133-3" WHERE "Ship's name" = 'Koningin Juliana';