鼓膜来源于何组织()A.外胚层——上皮层 B.中胚层——纤维层 C.内胚层——粘膜层 发布时间:2017-07-23 16:39 │ 来源:www.tikuol.com 题型:单项选择题 问题: 鼓膜来源于何组织()A.外胚层——上皮层B.中胚层——纤维层C.内胚层——粘膜层D.第一鳃沟与第一咽囊间E.以上都是
题型:单项选择题 It was reported in the newspaper that one of our students got the first place in the last Provincial Chemistry Olympic Contest _____ in June. [ ]A. having been held B. to be heldC. being held D. held 查看答案