可判断离心泵启泵前未彻底排空的现象是() ["A.电机振动过大","B.启泵时叶轮有“噼噼啪啪”声","C.机械密封渗漏","D.电流过大"]
对角支是下列哪支血管的主要分支() ["左室后支","前降支","回旋支","左主干","右冠状动脉"]
肾病综合征小儿常见并发症是() ["原发性腹膜炎","低钠血症","低钙血症","肾静脉血栓","以上均是"]
婴幼儿脑积水不宜采用Torkildsen手术,是因为() ["伴有颅内压增高","伴有颅腔扩大","伴有颅内肿瘤","伴有基底池粘连","伴有基底池梗阻"]
离心泵启泵前需要排空的原因是() ["A.避免启泵过程中电机振动过大","B.保护机械密封","C.避免流量瞬间过大","D.避免造成泵的气缚"]
什么是软件测试方法中的动态测试?