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铁心中就产生交变磁场。
A fluctuating magnetic field is produced in the iron.
youdao
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而交变应力集中是疲劳破坏的一个关键因素。
The concentration of alternate stress is a key factor of fatigue destruction.
youdao
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而交变应力集中是疲劳破坏的一个关键因素。
The concentration of alternate stress is a key factor of fatigue destruction.
youdao