Below is an instruction that describes a task. Write a response that appropriately completes the request.

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

### Inputs:
table_name: table, columns: ['Frequency', 'Station', 'Operator', 'Country of origin', 'Transmitter location', 'Format']

### Response:
SELECT Station FROM table WHERE Country of origin = china AND Frequency = 684khz