问题
选择题
— Where's _____________ mum?
— _____________ is at a supermarket. [ ]
A. you; She
B. your; She
C. your; Her
答案
答案：B
搜题请搜索小程序“爱下问搜题”
— Where's _____________ mum?
— _____________ is at a supermarket. [ ]
A. you; She
B. your; She
C. your; Her
答案：B
腈（CH3CN）溶液中加入等体积的水，所得溶液中乙腈的质量分数为0．4a，若乙腈的密度为
，水的密度为
，则下列说法正确的是
