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

游客2023-10-06 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

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.

Ingeneral,theancientRomanswerepracticalpeople.Theycaredlittleabou

Themosteasiestprocessformininggoldispanning,whichinvolvesusingacirc

Somedayastrangerwillreadyoure-mailwithoutyourpermissionorscanthe

Peoplelikebeingtrusted.Theyareannoyed,angry,orfeelhurtiftheyare

Thewordconservationhasathrifty(节俭)meaning.Toconserveistosaveand

国家法定计量单位的名称、符号由()公布。A.国务院 B.人民代表大会委员

治疗月经先期的方药，哪项是错误的A.补中益气汤（《脾胃论》） B.清经散（《傅

临床上用于诊断肝脏疾病的酶哪一组组合最佳A.ALT、AST、GGT、ALPB.A

乙胺碘呋酮抗心律失常的作用机理是（）。A.钙通道阻滞剂 B.β受体阻滞剂 C

施工招标采用最低评标价法，评标委员会推荐中标候选人的做法正确的是（）。A.推荐满