5,在饱和的硫化氢溶液中,下列微粒浓度比较,正确的是
( A )[H2S]>[H]=[HS]>[S2] ( B )[H2S]>[H]>[HS]>[S2]
( C )[H]>[H2S]>[HS]>[S2] ( D )[H]>[HS]>[S2]>[H2S]