在“线段，锐角，三角形，等边三角形”这四个图形中，是轴对称的_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题填空题

在“线段，锐角，三角形，等边三角形”这四个图形中，是轴对称的图形有（）个．

答案

3

选择题

We know that the Black Sea, one thousand years ago, was a fresh water lake about ______ and unconnected with the Mediterranean.

A. its two thirds present size
B. two-thirds size of the present
C. its two-thirds of the present size
D. two- thirds its present size

填空题

载人航天器供人类（）和（）的太空作各种探测、实验和研究的航天器。