脊髓灰质炎病毒最主要的感染类型是()。 A.急性感染 B.隐性感染 C.慢性感染 D 发布时间:2017-08-06 12:02 │ 来源:www.tikuol.com 题型:单项选择题 问题: 脊髓灰质炎病毒最主要的感染类型是()。A.急性感染B.隐性感染C.慢性感染D.潜伏感染E.迟发感染
题型:单项选择题 She had just finished her homework ________ her mother asked her to practise playing the piano yesterday.[ ]A. when B. whileC. after D. since 查看答案