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【单选题】
分几步完成的化学反应的总平衡常数是A.
各步平衡常数之和
B.
各步平衡常数之平均值
C.
各步平衡常数之差
D.
各步平衡常数之积
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must
【单选题】—What would you send to your sister as the Christmas gift? —I haven't decided yet. I _____ send her a hand bag. [ ]
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shall
B.
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A.
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ought to have sent
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B.
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C.
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C.
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D.
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