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【单选题】
美于承诺效力的下列表述中正确的是（）。A.
承诺在有效期限内，受要约人可以撤回和撤销承诺
B.
默示和不作为在特定情况下可以构成有效的承诺
C.
要约人于收到迟到承诺的撤回通知时，及时通知承诺人承诺撤回迟到的事实，则发生撤回承诺的法律效力
D.
承诺一经作出，并送达要约人，合同即告成立，要约人不得加以拒绝
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举一反三
【单选题】The first two stages in the development of civilized man were probably the invention of primitive weapons and the discovery of fire, although nobody knows exactly when people acquired the use of (1)__...
A.
the latter
B.
the later
C.
the second
D.
the latest
【单选题】The first two stages in the development of civilized man were probably the invention of primitive weapons and the discovery of fire, al though nobody knows exactly when acquired the use of (1)_____. T...
A.
the latter
B.
the later
C.
the second
D.
the latest
【简答题】标准电极电势是否等于电极与周围活度为1的电解质溶液之间的电势差?
【简答题】过程系统工程的核心思想是( )和( )思想。
【简答题】标准电极电势是否就等于电极与周围活度为1的电解质溶液之间的电势差？
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