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表面粗糙度的含义是什么？它与形状误差有何区别？
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表面粗糙度对零件的功能有何影响？
After the Civil War, African Americanswere granted citizenshipand the right to vote.
The Civil Rights Movement refers to a struggle for social justice that took place mainly during the 1960s and 1970sfor blacks to gain equal rights.
The first wave of feminism beganwith the publication of Mary Wollstonecraft'sA Vindication of the Rights of Woman.
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