A.Miners were required to wear more clothes while working underground.B.Workers were n

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A.Miners were required to wear more clothes while working underground.

B.Workers were not allowed to join together to fight for better conditions.

C.Mine owners could no longer make their men work 12 hour or more at a time.

D.Women and young girls were not permitted to work together with men in the coal mines.

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热搜:a是b的充分条件,b是a的必要条件吗