user: Question: Which Weight has a Power of kW (hp) at 1,800rpm, and a Name of 9 NC?
Columns: ['Name', 'Cyl.', 'Bore', 'Capacity', 'Power', 'Weight']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['9 AD', '9-cyl radial', 'mm (in)', 'l (cuin)', 'kW (hp) at 2,000rpm', 'Weight kg (lb)']
SQL:

assistant: SELECT "Weight" FROM "Table" WHERE "Power" = 'kW (hp) at 1,800rpm' AND "Name" = '9 NC';