真值表

A	B	AND	NAND	OR	NOR	XOR	IFF	IMPLIES
0	0	0	1	0	1	0	1	1
0	1	0	1	1	0	1	0	1
1	0	0	1	1	0	1	0	0
1	1	1	0	1	0	0	1	1