已知某药物的临床安全有效治疗浓度为10～20mg／L，t1／2=10h，V=0.5L／kg。某患者体重60kg，先静脉注射给药使血药浓

已知某药物的临床安全有效治疗浓度为10～20mg/L，t_1/2=10h，V=0.5L/kg。某患者体重60kg，先静脉注射给药使血药浓度达到10mg/L，再静脉滴注2小时，使血药浓度升至20mg/L，求：①静脉注射给药剂量；②静脉滴注速度。

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