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

游客2023-10-06 47

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:https://tihaiku.com/zcyy/3075105.html

相关试题推荐

Fewpeoplecan______themorningexerciseseveryday.A、insisttoB、goonC、wipe
Peoplegenerallycalleachotherbytheir(11)muchsoonerintheiracquaintance
Peoplegenerallycalleachotherbytheir(11)muchsoonerintheiracquaintance
TheRedCrossisaninternationalorganizationwhichcaresforpeoplewhoare
Themiddlepartofthe20thcenturybroughtnewwaystohelppeoplegetoverdis
Thepassagestatesthatpeoplefromvariouscultures______.[br]Generallyhost
Thepassagestatesthatpeoplefromvariouscultures______.[br]Accordingtot
Thepassagestatesthatpeoplefromvariouscultures______.[br]Inthethirds
Georgeisoneofthosepeoplewho______troubleinworkingoutthisproblem.A、h
Whenpeoplebecomegoodatdoingthethingstheyliketheyfindthemselves.

随机试题

Lookinginfromabroad,muchoftheworldhashistoricallybeenbaffledbyA
TheclashesinNigeriawerebetween______.[br][originaltext](l)Morethan
简述校长负责制在实施过程中应注意哪些问题。
下列关于局域网的描述中，正确的一条是（）。A.局域网的数据传输率高，数据传输可
患者男性，40岁，B超、CT均提示右肾癌，病史中提示与肾癌发病相关的信息是A、1
戏曲舞台上众多的艺术形象都有自己的一副面孔，但舞台上的人物毕竟是有限的，把生活中
孟鲁司特的作用机制是A.抑制α受体 B.阻断白三烯受体 C.抑制磷酸二酯酶
出口货物的申报期限为货物运抵海关监管区后、()。 A.装货前的24小时B.
哪种贫血可进行骨髓移植治疗？（　　）A.巨幼细胞性贫血 B.再生障碍性贫血
食物中毒与其他急性疾病最本质的区别是 A.病人曾进食同一批某种食物 B.很多

最新回复(0)

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

Fewpeoplecan______themorningexerciseseveryday.A、insisttoB、goonC、wipe

Peoplegenerallycalleachotherbytheir(11)muchsoonerintheiracquaintance

Peoplegenerallycalleachotherbytheir(11)muchsoonerintheiracquaintance

TheRedCrossisaninternationalorganizationwhichcaresforpeoplewhoare

Themiddlepartofthe20thcenturybroughtnewwaystohelppeoplegetoverdis

Thepassagestatesthatpeoplefromvariouscultures______.[br]Generallyhost

Thepassagestatesthatpeoplefromvariouscultures______.[br]Accordingtot

Thepassagestatesthatpeoplefromvariouscultures______.[br]Inthethirds

Georgeisoneofthosepeoplewho______troubleinworkingoutthisproblem.A、h

Whenpeoplebecomegoodatdoingthethingstheyliketheyfindthemselves.

Lookinginfromabroad,muchoftheworldhashistoricallybeenbaffledbyA

TheclashesinNigeriawerebetween______.[br][originaltext](l)Morethan

简述校长负责制在实施过程中应注意哪些问题。

下列关于局域网的描述中，正确的一条是（）。A.局域网的数据传输率高，数据传输可

患者男性，40岁，B超、CT均提示右肾癌，病史中提示与肾癌发病相关的信息是A、1

戏曲舞台上众多的艺术形象都有自己的一副面孔，但舞台上的人物毕竟是有限的，把生活中

孟鲁司特的作用机制是A.抑制α受体 B.阻断白三烯受体 C.抑制磷酸二酯酶

出口货物的申报期限为货物运抵海关监管区后、()。 A.装货前的24小时B.

哪种贫血可进行骨髓移植治疗？（ ）A.巨幼细胞性贫血 B.再生障碍性贫血

食物中毒与其他急性疾病最本质的区别是 A.病人曾进食同一批某种食物 B.很多

哪种贫血可进行骨髓移植治疗？（　　）A.巨幼细胞性贫血 B.再生障碍性贫血