易哈佛 \ 2022年职称英语

Why did the first two attempts to deliver samples fail?

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[单项选择题]Why did the first two attempts to deliver samples fail?

关键词: attempts deliver samples
A:The sample vaporized away.
B:Fresh material was exposed to the air.
C:The samples got stuck inside the scoop.
D:The robotic arm hit a hard rock.

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