CREATE TABLE table_51034 ("Date" CLOB, "Series" CLOB, "Circuit" CLOB, "City / State" CLOB, "Winner" CLOB, "Team" CLOB)

What is the circuit on 19 Apr with Craig Lowndes as the winner?
SELECT "Circuit" FROM table_51034 WHERE "Winner" = 'craig lowndes' AND "Date" = '19 apr'
SELECT "Circuit" FROM "table_51034" WHERE "Date" = '19 apr' AND "Winner" = 'craig lowndes'