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

游客2023-10-03 30

问题 Why didn’t people begin to use unmanned vehicles in undersea exploration until recently?
It is because of the ______.
[br] What does the author mean by saying "more challenging" in the last paragraph?

选项

答案 More demanding

解析

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

Doyouknowthepeople______liveovertheroad?A、whomB、whoC、whatD、whoseB本题

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Peoplewhoworknightshiftsareconstantlyfightingagainstan“internalcl

Howoftenonehearschildrenwishingtheyhadgrownup,andoldpeoplewishi

Howoftenonehearschildrenwishingtheyhadgrownup,andoldpeoplewishi

Howoftenonehearschildrenwishingtheyhadgrownup,andoldpeoplewishi

Howoftenonehearschildrenwishingtheyhadgrownup,andoldpeoplewishi

Peoplewillliveunderthegroundbecause______.[br]Somecountriestrytobuil

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匀质杆质量为m，长OA=l，在铅垂面内绕定轴O转动。杆质心C处连接刚度系数k较大

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