2. 职称英语
  3. Why didn’t people begin to use unmanned vehicles in undersea exploration until r

Why didn’t people begin to use unmanned vehicles in undersea exploration until r

游客2023-10-06  67
问题 Why didn’t people begin to use unmanned vehicles in undersea exploration until recently?
It is because of the ______.
[br] Why is ocean exploration not so expensive as space travel?
Because ______ for submersibles to get away from the Earth’s gravity.
选项
答案 there’s no need
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3075106.html
相关试题推荐
随机试题
最新回复(0)