掌握传染病潜伏期的意义在于()
A.协助诊断
B.协助治疗
C.确定医学观察期
D.判断预后
E.预测疫情
参考答案:A, C
Li Ming could play the piano when he was eight [ ]
A. at the age of eight
B. eight years late
C. for eight years
D. eight years age
完整的说,我国的“青铜器时代”应包括
A.夏、商
B.商、周
C.西周、春秋、战国
D.夏、商、周