(2)SD=0,RD=1 设原态为“0” 态 &G1 &G2 翻转为“1” 0 态0 1 设原态为“0” 态 0 1 1 1 0 翻转为“ 0 1” 态 (2) SD =0，RD = 1 Q Q . G1 & . & G2 SD RD