IR中苯的单取代峰应属于A.1900cmˉ1 B.1500cmˉ1 C.760cmˉ 发布时间:2023-08-08 23:22 │ 来源:www.tikuol.com 题型:多项选择题 问题: IR中苯的单取代峰应属于A.1900cmˉ1B.1500cmˉ1C.760cmˉ1D.690cmˉ1E.650cmˉ1
题型:多项选择题 .Before she came to England, she had never heard a single English word ___________.A.speakingB.spokenC.to speakD.speak 查看答案