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

游客2023-10-08 66

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

Facebookiscrackingdownoncryptocurrencies(加密数字货币)byusingoneofitsmo

WhatIfACollegeEducationJustIsn’tforEveryone?[A]Longbef

管理控制的基本任务就是（），适应环境变化。A.发现偏差 B.分析原因 C.

男孩，2岁。因发热3d，呕吐2次，烦躁、多汗。昨晚突然哭声嘶哑，吃奶呛，随后吞咽

患者，女，36岁。甲状腺部位疼痛，甲状腺肿大，有压痛，诊断为桥本病，以下哪种抗体

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