统计调查的三个阶段是什么?
参考答案:
(1)统计资料收集(2)统计资料整理(3)统计分析
He worked late last night, ______, early this morning.
A.that is
B.even worse
C.or rather
D.namely
深部软组织化脓性炎症的早期首选的物理治疗是
A.无热量超短波B.微热量超短波C.热敷D.红斑量紫外线E.红外线