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依据访问形式不同，访问调查法可以有哪几种形式？

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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？

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.