问题：
[单选题]在进行吸收设备的计算时,液气比计算公式 中,下列哪种参数 组合往往是未知的( ).
A、吸收剂用量L和液相出口浓度X1
B、吸收剂用量L和气相出口浓度Y2
C、惰气量V 和液相出口浓度X1
D、惰气量V 和气相出口浓度Y2
参考答案：
A
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