單項選擇題硫醚、亞砜、砜的通式分別為()。

A.R-S-R、R-S=OR'、R-SO2-R
B.R-S=OR'、R-SO2-R、R-S-R
C.R-SO2-R、R-S-R、R-S=OR'
D.R-S=OR'、R-S=OR、R-S-R


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