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2023-10-08  61
问题 Why didn’t people begin to use unmanned vehicles in undersea exploration until recently?
It is because of the ______.
[br] What does the author mean by saying "more challenging" in the last paragraph?
选项
答案 More demanding
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/3082913.html
相关试题推荐
随机试题
最新回复(0)