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【单选题】
下列反应的平衡常数可以用K=1/[H2]表示的是A.
H2(g)+S(g)=H2S(g)
B.
H2(g)+S(s)=H2S(g)
C.
H2(g)+S(s)=H2S(l)
D.
H2(l)+S(s)=H2S(g)
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