Questionsare based on the passage you have just heard.

Questionsare based on the passage you have just heard.

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What is the proportion of people with breast cancer that are

What is the proportion of people with breast cancer that are inherited?

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Christopher Ross’experimental results revealed that genetic

Christopher Ross’experimental results revealed that genetic testing may help____

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恢复通风前,必须检查瓦斯。只有在局部通风机及其开关附近l0m以内风流中的瓦斯浓度都不超过(  )时,方可人工开启局部通风

恢复通风前,必须检查瓦斯。只有在局部通风机及其开关附近l0m以内风流中的瓦斯浓度都不超过(  )时,方可人工开启局部通风机。

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如果锅炉发生严重满水事故时应采取(  )的措施。

如果锅炉发生严重满水事故时应采取(  )的措施。

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