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

游客2024-07-19 13

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

Atlast,abouttwent7people______atthemeeting.A、turnedonB、turnedupC、tur

OveramillionpeoplevisitHawaiieachyearbecauseofitsbeautifulweather

OveramillionpeoplevisitHawaiieachyearbecauseofitsbeautifulweather

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Whydidn’tpeoplebegintouseunmannedvehiclesinunderseaexplorationuntilr

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Asinthefieldofspacetravel,soinunderseaexplorationnewtechnologies

Thesedays,peoplewhodomanualworkoften(11)farmoremoneythanpeoplew

Thesedays,peoplewhodomanualworkoften(11)farmoremoneythanpeoplew

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[originaltext]Today,cigarettesmokingisawidespreadhabit.Aboutforty-t

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（ ）的作用是将合格生球依次经过鼓风干燥、抽风干燥、预热、焙烧、均热、一次冷却

33岁女性银行职员，3年前因工作劳累出现头痛，后总担心自己得了心脑血管病等，自觉

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