在发生人感染H7N9禽流感确诊病例的县(区)内，应当在病例确诊后开展为期()的强化监测
A、3天D
暂无解析
Thedoctorsare________abouttheguidelinesunderwhichtheycancarryouteuthanasia.
Tounderstandthesentence,youshouldanalyzeitsparts________.
Ifanearthquakeoccurred，someoftheone-storeyhouses________.
句子写作：Iwasveryembarrassed.Ididn’tknowwhatIshoulddo.
根据对患者人身造成的损害程度，医疗事故分为______
