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考查表明,随着药物细度变小,其置换值也变小。并提出药物对混合基质的置换值计算公式f=(W_A·f_A+W_B·f_B+…)/(W_A+W_B+…)。
Test showed that, as the drug becomes smaller, its replacement value becomes smaller. And proposed the substitution formula of the drug to the mixed matrix f = (W_A · f_A + W_B · f_B + ...) / (W_A + W_B + ...).