Beer-Battered Onion Rings

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Vegetable oil, for deep-frying

1 1/2 cups all-purpose flour

1 1/4 cups rice flour

2 1/2 teaspoons baking powder

1 tablespoon Montreal steak seasoning (not low-sodium)

Kosher salt and freshly ground pepper

1 12-ounce bottle Belgian white beer, chilled

1/2 cup seltzer, chilled

2 sweet onions (such as Vidalia), sliced into 1/2-inch-thick rings