题目内容

什么叫边缘系统?它在人的行为和心理活动中有什么重要作用?

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The young man had to() the inevitable fact that he would not be able to come back to his motherland again.

大六角头高强度螺栓连接副一般采用()和()紧固。

There is more to a woman than her looks, so I() the fact that after a woman grows old and loses her looks people stop paying attention to her.

国家标准《涂装前钢材表面锈蚀等级和除锈等级》(GB8923—88)将除锈等级分成()除锈、()除锈、()除锈三种类型。

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