正常人血液在血管内不凝固的原因是() ["A.凝血酶原无活性","B.血液中有抗凝物质存在","C.纤维蛋白溶解系统起作用","D.血管内膜光滑完整","E.血流速度快"]
斑贴试验观察结果的时间为() ["A.2小时","B.12~24小时","C.24~48小时","D.1周"]
超急性结膜炎的常见致病菌的传染途径是_________、_________。
皮内试验时注射形成的皮丘直径为() ["A.0.05cm","B.O.1cm","C.0.5cm","D.1.Ocm"]
有关过期妊娠的定义,准确的是() ["A.妊娠达到42周","B.妊娠超过42周","C.妊娠达到或超过40周","D.妊娠达到或超过43周","E.妊娠达到或超过42周"]
慢性结膜炎常见的非感染性因素为_________、_________、_________、_________、_________和_________。