在怀孕中期后妊娠黄体逐渐消失,主要以胎盘产生孕激素来维持妊娠到分娩的动物是() ["牛","猪","犬","马和绵羊","兔"]
血清淀粉酶的正常值()。 ["80~100U/L","800~1800U/L","2000~2800U/L","3000~12000U/L","13000~15000U/L"]
判别大三阳区别于小三阳的主要检查项目是() ["抗-HBs(+)","抗-HBc(+)","抗-HBe(+)","HBeAg(+)","HBsAg(+)"]
通过测定孕酮含量,诊断牛早期妊娠的最佳时期是() ["配种后24d","配种后35d","配种后40d","配种后72d","配种后100d"]
应用华法林抗凝治疗时,INR安全有效范围为血栓性疾病患者实施抗凝治疗,应该控制国际标准化比值为() ["<2.0",">3.0","2.0~3.0","2.0~2.5","0.8~2.0"]
初产妇,宫口开3cm,行人工破膜后9小时宫口9cm()。宫口扩开9cm,1小时后儿头下降0.5cm()。