问题
选择题
We have a big library ______ lots of useful books. [ ]
A. in
B. at
C. with
D. on
答案
答案：C
搜题请搜索小程序“爱下问搜题”
We have a big library ______ lots of useful books. [ ]
A. in
B. at
C. with
D. on
答案：C
② NH4Cl电子式：
④ 丙烷分子的球棍模型：