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

游客2023-10-03 36

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

转载请注明原文地址:http://tihaiku.com/zcyy/3067437.html

相关试题推荐

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

随机试题

Accordingtolegend,Aesculapiusboretwodaughters,PanaceaandHyegeia,who
Theremarkable______oflifeontheGalopagosIslandsinspiredCharlesDarwinto
【S1】[br]【S2】C结合句意“我们整个的目的就是让人们怀疑自己…”，再根据备选项中的名词释义，C最符合文意。且文章的下两句都是对这一syste
康复治疗学的内容不包括A.物理治疗 B.作业治疗 C.言语治疗 D.心理治
再生障碍性贫血通常没有下面哪一项表现A.脾肿大 B.发热 C.血尿 D.出
6个月小儿进行免疫接种后第二天，接种部位出现4cm红肿伴淋巴结轻度肿大，属于A、
胡夫金字塔：埃及 A.帕特农神庙：雅典 B.埃菲尔铁塔：法国 C.秦始皇陵
①我们需要什么样的媒体？②信息化时代，新兴媒体有着无可比拟的优势③信息海量、传播
甲、乙、丙诉丁遗产继承纠纷一案，甲不服法院作出的一审判决，认为分配给丙和丁的遗产
以下不属于信托产品管理方式的是（）。A.信托产品的现场检查 B.受益人大会

最新回复(0)

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

Accordingtolegend,Aesculapiusboretwodaughters,PanaceaandHyegeia,who

Theremarkable______oflifeontheGalopagosIslandsinspiredCharlesDarwinto

【S1】[br]【S2】C结合句意“我们整个的目的就是让人们怀疑自己…”，再根据备选项中的名词释义，C最符合文意。且文章的下两句都是对这一syste

康复治疗学的内容不包括A.物理治疗 B.作业治疗 C.言语治疗 D.心理治

再生障碍性贫血通常没有下面哪一项表现A.脾肿大 B.发热 C.血尿 D.出

6个月小儿进行免疫接种后第二天，接种部位出现4cm红肿伴淋巴结轻度肿大，属于A、

胡夫金字塔：埃及 A.帕特农神庙：雅典 B.埃菲尔铁塔：法国 C.秦始皇陵

①我们需要什么样的媒体？②信息化时代，新兴媒体有着无可比拟的优势③信息海量、传播

甲、乙、丙诉丁遗产继承纠纷一案，甲不服法院作出的一审判决，认为分配给丙和丁的遗产

以下不属于信托产品管理方式的是（）。A.信托产品的现场检查 B.受益人大会