使用显微镜观察某一细胞时,选择下列哪种组合所观察的物像最大( )
①5错误目镜 ②10错误目镜 ③10错误物镜 ④40错误物镜.
A:①③
B:①④
C:②③
D:②④
海水是巨大的资源宝库,利用海水为原料可获得许多化工产品.
- Whose home is ______ from school, Alice's or Daisy's?
- Alice's, I think.
When she knew her son was out of danger, she was relaxed.