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

游客2023-10-03 69

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

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Peopleacquireknowledge,skills,【11】,values,orattitudesthrougheducatio

Peopleacquireknowledge,skills,【11】,values,orattitudesthrougheducatio

Peopleacquireknowledge,skills,【11】,values,orattitudesthrougheducatio

Peoplewhoworknightshiftsareconstantlyfightingagainstan“internalcl

Howoftenonehearschildrenwishingtheyhadgrownup,andoldpeoplewishi

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Howoftenonehearschildrenwishingtheyhadgrownup,andoldpeoplewishi

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孕妇，24岁，GP，宫内孕40周，破水24小时，胎儿手脱出阴道口来诊。检查：产妇

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