user: Question: What is Model Number, when Voltage is 2.0V, and when Frequency is 350 MHz?
Columns: ['Model number', 'Frequency', 'L2 cache', 'Mult.', 'Voltage', 'Socket']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Pentium II 266', '267 MHz', '512 KB', '4×', '2.0V', 'Slot 1']
SQL:

assistant: SELECT "Model number" FROM "Table" WHERE "Voltage" = '2.0V' AND "Frequency" = '350 MHz';