Test center: decimal elementary arithmetic.
Analysis: This problem first calculates what this factor is according to the product, one factor = another factor, and then subtracts 0.57 to get the result.
Solution: 19.6÷2.8-0.57
=7-0.57,
=6.43.
A: Another factor is that 6.43 is greater than 0.57.
Comments: This question examines students' ability to list correct formulas and answer according to the meaning of the question.