my hairs are black and long,my hair is black and long,哪一句对?

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my hairs are black and long,my hair is black and long,哪一句对?
my hairs are black and long,my hair is black and long,哪一句对?

my hairs are black and long,my hair is black and long,哪一句对?
hair以复数形式出现的时候表示五彦六色的头发