9. A and B are sawing some logs at the same time, with each log having the same length and thickness. A cuts each log into 3 pieces, while B cuts each log into 2 pieces. After the same period of time, A has 24 pieces of wood, and B has 28 pieces of wood. Therefore, $\qquad$ (fill in "A" or "B") takes less time to saw a log once.


Answer: A
Exam Point: Sawing wood + Unitary problem
Analysis: A: $24 \div 3=8$ (pieces), each piece is sawed 3-1=2 (times), in total sawed: 8×2=16 (times); B: $28 \div 2=14$ (pieces), each piece is sawed $2-1=1$ (time), in total sawed: $14 \times 1=14$ (times). A saw 16 times and B saw 14 times took the same amount of time, indicating that A saws faster.