【单选题】【消耗次数：1】
何尔登效应是指
①
O2与Hb结合将促使CO2释放
②
O2与Hb结合将抑制CO2释放
③
O2与Hb结合将促使CO2结合
④
CO2与Hb结合将促使O2释放
⑤
CO2与Hb结合将抑制O2释放
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