18的因数一共有请选择CBA3r5x8Y9s8H9m/?:~/B3}9u5x+r'I6[/h;Z
A．4个9m/?:~/B3}9u5x+r'I6[/h;Z
B．5个9m/?:~/B3}9u5x+r'I6[/h;Z
C．6个9m/?:~/B3}9u5x+r'I6[/h;Z