主要因红细胞生成减少、红细胞破坏过度及失血引起的症状是() ["A．贫血","B．继发感染","C．出血","D．心悸","E．晕厥"] 服用铁剂后大便发黑的主要原因是() ["A．药物本身呈黑色","B．肠壁血管被腐蚀","C．引起肠粘膜溃疡","D．生成硫化铁所致","E．形成正铁血红素"] 由血清蛋白引起输血反应的患者需再次输血时输注何种血液制品最佳() ["A．红细胞悬液","B．辐射红细胞","C．洗涤红细胞","D．冷冻红细胞","E．浓缩红细胞"] 铁注射剂应备肾上腺素，主要是因为() ["A．局部不易吸收","B．严重者可发生过敏性休克","C．易有心血管反应","D．易出现尿路刺激征","E．不通过肠粘膜屏障而直接入血"] 铁剂最佳给药时间() ["A．两餐之间","B．餐中","C．餐前","D．睡前","E．早晨空腹"] 下列哪项有关于口服铁剂护理不正确的是()