题目内容
All the men and women who forged the Underground Railroad were blacks.
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These railroad conductors were frequently faced with death threats and warnings from local government.
Many fugitives chose Canada as their primary destination because slavery had been abolished there.
Barbara Cater thought her great-great -grandfather was a heroic civil-rights fighter and never give up struggling for freedom.
在构造和受力上,与连续梁桥相比,连续刚构桥与连续梁桥的区别有( ) 。
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