CREATE TABLE table_name_75 (type VARCHAR, date VARCHAR, ship VARCHAR)

What type has a Date of 8 dec 16, and a Ship of duchess of cornwall?
SELECT type FROM table_name_75 WHERE date = "8 dec 16" AND ship = "duchess of cornwall"
SELECT "type" FROM "table_name_75" WHERE "8 dec 16" = "date" AND "duchess of cornwall" = "ship"