Question: What reactor type that has a commercial operation of —, and a Tianwan-7 unit?
SQL: SELECT "Reactor type" FROM "2-12922162-1" WHERE "Commercial operation" = '—' AND "Unit" = 'Tianwan-7';

Question: What was the net capacity with a gross capacity of 1,126 MW, and a Unit of Tianwan-4?
SQL: SELECT "Net capacity" FROM "2-12922162-1" WHERE "Gross capacity" = '1,126 MW' AND "Unit" = 'Tianwan-4';

Question: What commercial operation that has a gross capacity of 1,126 MW, and a unit of Tianwan-4?
SQL: SELECT "Commercial operation" FROM "2-12922162-1" WHERE "Gross capacity" = '1,126 MW' AND "Unit" = 'Tianwan-4';