2. 外语
  3. Why didn’t people begin to use unmanned vehicles in undersea exploration until recently? It is because of the ______. When

Why didn’t people begin to use unmanned vehicles in undersea exploration until recently? It is because of the ______. When

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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 ______.

When must the sonar devices be placed?
   Before the ______.
选项
答案undersea vehicle dives
解析
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