CREATE TABLE table_42136 ("Name" TEXT, "Main span metres" TEXT, "Main span feet" TEXT, "Year to open" FLOAT, "Country" TEXT)

What is the Main span of the bridge from China with a Year to open of 2013 and Main span feet of 2,585?
SELECT "Main span metres" FROM table_42136 WHERE "Year to open" = '2013' AND "Country" = 'china' AND "Main span feet" = '2,585'
SELECT "Main span metres" FROM "table_42136" WHERE "Country" = 'china' AND "Main span feet" = '2,585' AND "Year to open" = '2013'