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  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2023-10-03  13
问题 Why didn’t people begin to use unmanned vehicles in undersea exploration until recently?
   It is because of the ______.
[br] What will happen to a submersible in deep water if it is not well built?
   It is most likely to ______.
选项
答案 get crushed
解析
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