某患者单次静脉注射某药物10毫克,求0.5小时血药浓度是多少。一直半衰期是4h,v=60L 求解题的详细步骤 C=C0*e-kt=10/60*e-(0.693/4*0.5)
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发生在花卉上的害虫种类较多,自制一些药剂防治花卉害虫能取得较好效果,方法简便,而且省钱。 1、烟草:具有胃毒,触杀和熏蒸作用,由于渗透力强,可使害虫神经麻痹中毒死亡。用法是用烟叶梗或吸剩的烟
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