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

游客2023-10-08 34

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

Somepeoplegetused______anditishardforthemtostop.A、tosmokeB、tosmok

Friendshipisbothasourceof(11)andgoodhealth.Peoplewhohaveclosefrien

Withthesteadyincreaseintheamountofleisuretimethatpeopleenjoytoda

Withthesteadyincreaseintheamountofleisuretimethatpeopleenjoytoda

Withthesteadyincreaseintheamountofleisuretimethatpeopleenjoytoda

Withthesteadyincreaseintheamountofleisuretimethatpeopleenjoytoda

Inoldtimes,peoplewonderedaboutthechangesofseasons,aboutthestars,

Themainideaofthispassageis______.[br]Peoplewentbacktothecountrysid

Themainideaofthispassageis______.[br]Twohundredyearsago,peoplemove

Intheeighteenthcentury,citiesbecamelargerandlarger.Peoplemovedfrom

Whatkindofjobsmaymendobest,accordingtothepassage?[originaltext]W

Theofficestaff_______assembledoutsidethebuildingtomournthevictimsint

Cellphonescanmakeourlife______.[br]Ifpeopleleavetheirphonesathome,

[originaltext]Europehassomeofthetoughestguncontrollawsintheworldand

Whenacompanypreparesapricelist,itwilltakeinto(consider)______allthe

患儿，女，4个月，肺炎入院。医嘱给予心电监护，安静状态下患儿生命体征如图所示。护

乳房纤维腺瘤的主要临床表现是A.乳房胀痛 B.乳头溢液 C.乳房肿块 D.

设A、B、C为三个事件，则A、B、C同时发生可表为()。A、A∩B∩C B、

客户主营业务的演变中，原客户经营业务不善，因拥有物业便放弃具体经营而改为出租物业

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下列各项中，适合作为单位级作业的作业动因有（　　）。A.生产准备次数 B.零部