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

游客2023-10-06 52

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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