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

游客2023-10-03 19

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

Peopleacquireknowledge,skills,【11】,values,orattitudesthrougheducatio

Peopleacquireknowledge,skills,【11】,values,orattitudesthrougheducatio

Peopleacquireknowledge,skills,【11】,values,orattitudesthrougheducatio

Peoplewhoworknightshiftsareconstantlyfightingagainstan“internalcl

Howoftenonehearschildrenwishingtheyhadgrownup,andoldpeoplewishi

Howoftenonehearschildrenwishingtheyhadgrownup,andoldpeoplewishi

Howoftenonehearschildrenwishingtheyhadgrownup,andoldpeoplewishi

Howoftenonehearschildrenwishingtheyhadgrownup,andoldpeoplewishi

Peoplewillliveunderthegroundbecause______.[br]Somecountriestrytobuil

Ithasbeensaidthateveryonelivesbysellingsomething.Inthelightoft

[originaltext]M：Howmucharethesetables?W：Theyare＄50foreachor＄95fora

[originaltext]W:Excuseme.IhaveanappointmentwithMr.Liatnine.MayIcom

下列句子没有语病的是（ ）。A.对初学者，可以读点语法方面的普通教材 B.听

A.球部尿道损伤 B.悬垂部尿道损伤 C.后尿道损伤 D.腹膜内膀胱破裂

下列与原子核相关的知识，表述正确的是()。A.β衰变现象说明电子是原子核的组成部

在一次招标投标活动中，确定了某施工单位为某项目的中标人，则下列表述中不正确的是（

平均动脉压＜P>A.判断呼吸性酸碱紊乱的指标＜br>B.反映血容量是否充足的指标

学习是由反复经验引起的，它所引起的行为及行为潜能的变化是暂时的。 （）

根据《宪法》，下列说法正确的是：A.国家建立健全同经济社会发展水平相适应的社会保

下列句子没有语病的是（　　）。A.对初学者，可以读点语法方面的普通教材 B.听

学习是由反复经验引起的，它所引起的行为及行为潜能的变化是暂时的。（）