题目内容
常用的销有圆柱销、圆锥销和开口销等，它们都是标准件。
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圆锥销的锥度为1：50 。
查表确定圆柱销标记是否正确：销 GB/T119.1 6m6 x 36
Many books about the American Civil War written years ago are________________________ now, but you may still find some in the National Library of China.
Gone With the Wind , in which Margaret Mitchell narrates a story about a girl's "survival" during the American Civil War and Reconstruction Era, has become a top American fiction bestseller since the year it ______________________________.
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