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能直接和CPU交换信息的存储器是
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有四种厚度不等的Q345钢板，其中( )厚的钢板强度最高。
Who first used the term "communicative competence" in deliberate contrast to Chomsky's "linguistic competence"（）
下列选项中，不属于可以不进行招标情况的规定的是( )。
The Natural Approach uses three stages as a basis for beginners: 1 ______; 2 giving the students comprehensible input about experiences and allowing for opportunities to engage in conversations about their own experiences; and 3 input and discussions, concerning opinions.
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