题目内容

以可可豆脂为基质，制备硼酸肛门栓10枚，已知每粒栓剂含硼酸0.4g，纯基质栓剂为2g，硼酸的置换价为2，在此处方中所需要可可豆脂的重量为

A. 6g
B. 12g
C. 18g
D. 24g
E. 30g

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