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

游客2024-07-24 52

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/3691367.html

相关试题推荐

Mostparentsandteachersdonotlikeyoungpeopletoreadcomicbooks(连环画),
Mostparentsandteachersdonotlikeyoungpeopletoreadcomicbooks(连环画),
Mostparentsandteachersdonotlikeyoungpeopletoreadcomicbooks(连环画),
VisitorstotheUnitedStatespossiblyfeelthatcitypeopleofthecountryare
VisitorstotheUnitedStatespossiblyfeelthatcitypeopleofthecountryare
Cellphonescanmakeourlife______.[br]Ifpeopleleavetheirphonesathome,
Todayalmosteverybodyisusingacellphone.Nowpeopleareabletocarryth
Inthecourseofhistory,people______(send)messagesinmanydifferentways.ha
Thoughpeopleplantmanytreesinthisareaeveryyear,thetopofsomehillsis
Manypeoplewholiveincitiessaythattheydislikecitylife.Theysaythe

随机试题

[img]ct_epem_epelisv_00611(20097)[/img][br][originaltext]Wouldyoulikeagla
Mostofthemachinesintheworkshop______nextmonth.A、arerepairedB、havebeen
[originaltext]M:Hi,Jane,youdon’tlookhappy.What’swrong?W:Well,Mike,I
TheRedistributionofHopeA)"HOPE"
【S1】[br]【S8】J由句中的than可以推知此处填人的是一个形容词比较级，说明结婚人口的比例，括号中的数字95percent断定了空格处应填入J.l
已知函数f(x)可导，且f(1)=1，f'(1)=2，设g(x)=f(f(1+3
A.b＜0.75B B.b＜0.7B C.b＜0.6B D.b＜0.5B
下面不属于医德品质内容的是()A.诚挚 B.幸福 C.公正 D.严谨
根据所提供的教材片段，合理设计l课时的教学简案。要求：(1)写出一篇规范、完
犯罪是一种违法行为，以下哪项是犯罪的基本特征？（）A.社会危害性 B.人

最新回复(0)

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

Mostparentsandteachersdonotlikeyoungpeopletoreadcomicbooks(连环画),

Mostparentsandteachersdonotlikeyoungpeopletoreadcomicbooks(连环画),

Mostparentsandteachersdonotlikeyoungpeopletoreadcomicbooks(连环画),

VisitorstotheUnitedStatespossiblyfeelthatcitypeopleofthecountryare

VisitorstotheUnitedStatespossiblyfeelthatcitypeopleofthecountryare

Cellphonescanmakeourlife______.[br]Ifpeopleleavetheirphonesathome,

Todayalmosteverybodyisusingacellphone.Nowpeopleareabletocarryth

Inthecourseofhistory,people______(send)messagesinmanydifferentways.ha

Thoughpeopleplantmanytreesinthisareaeveryyear,thetopofsomehillsis

Manypeoplewholiveincitiessaythattheydislikecitylife.Theysaythe

[img]ct_epem_epelisv_00611(20097)[/img][br][originaltext]Wouldyoulikeagla

Mostofthemachinesintheworkshop______nextmonth.A、arerepairedB、havebeen

[originaltext]M:Hi,Jane,youdon’tlookhappy.What’swrong?W:Well,Mike,I

TheRedistributionofHopeA)"HOPE"

【S1】[br]【S8】J由句中的than可以推知此处填人的是一个形容词比较级，说明结婚人口的比例，括号中的数字95percent断定了空格处应填入J.l

已知函数f(x)可导，且f(1)=1，f'(1)=2，设g(x)=f(f(1+3

A.b＜0.75B B.b＜0.7B C.b＜0.6B D.b＜0.5B

下面不属于医德品质内容的是()A.诚挚 B.幸福 C.公正 D.严谨

根据所提供的教材片段，合理设计l课时的教学简案。 要求：(1)写出一篇规范、完

犯罪是一种违法行为，以下哪项是犯罪的基本特征？（）A.社会危害性 B.人

根据所提供的教材片段，合理设计l课时的教学简案。要求：(1)写出一篇规范、完