Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_25 (reactor_type VARCHAR, commercial_operation VARCHAR, unit VARCHAR)
### Question:
What reactor type that has a commercial operation of —, and a tianwan-7 unit?
### Answer:
SELECT reactor_type FROM table_name_25 WHERE commercial_operation = "—" AND unit = "tianwan-7"