CREATE TABLE table_55400 ("Ship's name" TEXT, "Date entered service" TEXT, "Date withdrawn" TEXT, "Tonnage" FLOAT, "Type of Ship" TEXT)

what is the ships name that is a twin screw ro-ro motorship and entered service on 11 february 1983?
SELECT "Ship's name" FROM table_55400 WHERE "Type of Ship" = 'twin screw ro-ro motorship' AND "Date entered service" = '11 february 1983'
SELECT "Ship's name" FROM "table_55400" WHERE "Date entered service" = '11 february 1983' AND "Type of Ship" = 'twin screw ro-ro motorship'