user: Question: Which station is from China and has a frequency of 684kHz?
Columns: ['Frequency', 'Station', 'Operator', 'Country of origin', 'Transmitter location', 'Format']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['5.965MHz (SW)', 'Radio Klasik', 'RTM', 'Malaysia', 'IBC , Malaysia', 'News and Music']
SQL:

assistant: SELECT "Station" FROM "Table" WHERE "Country of origin" = 'China' AND "Frequency" = '684kHz';