题目内容

评定表面粗糙度的取样长度至少包含（）个峰和谷

A. 3
B. 4
C. 5
D. 6

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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？

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.

A. 对
B. 错

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.

A. 对
B. 错