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biconditional
双条件式
对于任何命题P、Q而言,P是Q的充分必要条件,P成立时,Q成立;Q成立时,P成立,即P等价于Q的条件式。用符号“↔”表示。又称等值式。
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describing function
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description of entrustment of case submission for inspection
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Description of the Barbarians of the Isles
Description of the Earth(Eudoxe de Cnide)
Description of the Materia Medica
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Description Plates for Cultural Relics on Display
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