Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_64209 ( "Frequency" text, "Station" text, "Operator" text, "Country of origin" text, "Transmitter location" text, "Format" text )

### Question ###
Which station is from China and has a frequency of 684khz?

### Accurate SQL ###

SELECT "Station" FROM table_64209 WHERE "Country of origin" = 'china' AND "Frequency" = '684khz'