A.+2、+3、+4 B.+3、+6、+7 C.+1、+2、+3 D.+2、+4、+6
A.R-S-R、R-S=OR'、R-SO2-RB.R-S=OR'、R-SO2-R、R-S-RC.R-SO2-R、R-S-R、R-S=OR'D.R-S=OR'、R-S=OR、R-S-R