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

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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] When must the sonar devices be placed?
Before the ______.

选项

答案 undersea vehicle dives

解析

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

Mostparentsandteachersdonotlikeyoungpeopletoreadcomicbooks(连环画册)

Mostparentsandteachersdonotlikeyoungpeopletoreadcomicbooks(连环画册)

Mostparentsandteachersdonotlikeyoungpeopletoreadcomicbooks(连环画册)

Mostparentsandteachersdonotlikeyoungpeopletoreadcomicbooks(连环画册)

Mysuggestionisthatwe(send)______afewpeopletohelptheothergroups.send

Buyinginsurance(保险)isawayinwhichpeoplecanprotectthemselvesagainstla

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Computerhasthepowerto______peoplearoundtheworldtoworktogether.A、allo

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