题目内容
The negotiations which ______ the signing of the treaty took place over a number of years.
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Once the ______ contradiction is grasped, all problems will be readily solved.
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On the first day when a pupil enters school, he is asked to ______ to the school rules.
夹板门内部要干燥，做透气孔贯穿上下框格，透气孔孔径一般为( )mm。
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