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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
2023-10-06
23
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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
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