输卵管绝育术的手术时间下列哪项不适宜() ["人工流产后可立即","自然流产后可立即","取环术后可立即","中期引产后休息1天","正常产后1~3天"]
ELISA测定细胞因子浓度的评价中正确的是() ["特异性差","测定的是细胞因子生物活性","测定需要维持依赖性细胞株","测定结果与所用的抗体的来源及亲和力有很大关系","标本中存在的细胞因子的可溶性受体对结果无干扰作用"]
当木材干燥时,首先失去的是()。 ["吸附水","化合水","自由水","蒸馏水"]
使血钙浓度降低的激素() ["胰岛素","抗利尿激素","甲状旁腺素","降钙素","醛固酮"]
药物性中期引产不包括() ["芫花萜","芫花醇","天花粉","利凡诺","米非司酮"]
建立国际物流系统网络应注意哪些问题?