CREATE TABLE table_21977704_1 (no VARCHAR2, entrant VARCHAR2, driver VARCHAR2)

Name the number for autom vil club argentino for juan manuel fangio
SELECT no FROM table_21977704_1 WHERE entrant = "Automóvil Club Argentino" AND driver = "Juan Manuel Fangio"
SELECT "no" FROM "table_21977704_1" WHERE "Automóvil Club Argentino" = "entrant" AND "Juan Manuel Fangio" = "driver"