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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
2024-07-30
12
管理
问题
Why didn’t people begin to use unmanned vehicles in undersea exploration until recently?
It is because of the ______.
[br] When must the sonar devices be placed?
Before the ______.
选项
答案
undersea vehicle dives
解析
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