某体系存在 C(s),H 2 O(g),CO(g),CO 2 (g),H 2 (g) 五种物质,相互建立了下述三个平衡: H 2 O(g) + C(s)→ H 2 (g) + CO(g) CO 2 (g) + H 2 (g)→H 2 O(g) + CO(g) CO 2 (g) + C(s)→2CO(g) 则该体系的自由度为
A.
f=1
B.
f=2
C.
f=3
D.
f=0
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