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【单选题】
已知下列反应的平衡常数：①H 2 (g)+S(s) H 2 S(g) K1； ②S(s)+O 2 (g) SO 2 (g) K2， 则反应③H 2 (g)+ SO 2 (g) O 2 (g)+ H 2 S(g)的平衡常数是 [ ]A.
K1+K2
B.
K1-K2
C.
K1×K2
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A.
wonderful
B.
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C.
modern
D.
rare
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【单选题】Which of the following is NOT true about how people learn a foreign language?
A.
People started learning a foreign language at different ages.
B.
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C.
People learn languages for different reasons.
D.
People learn languages in the same way.
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