A:32与﹣23
B:﹣23与(﹣2)3
C:﹣32与(﹣3)2
D:(﹣3×2)2与23×(﹣3)
— It's kind you to help me.
— Don't mention it.
鲁班是我国一位伟大的发明家,他发明了锯。( )