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A．Only three of the
four aspects of internal and external balance can be accommodated
simultaneously.
B．Only two of the
four aspects of internal and external balance can be accommodated
simultaneously.
C．Only one of the
four aspects of internal and external balance can be accommodated
simultaneously.
D．Only two of the
three aspects of internal and external balance can be accommodated
simultaneously.
A.内在强化 B.外在强化 C.定比强化 D.变比强化
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