The middle often consists of several paragraphs arranged in some kind of order. What does the order of the middle depends on ? 1the nature of the subject 2the type of paper to be written 3the beginning and the end
A.
①
B.
②
C.
③
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参考答案:
举一反三
【单选题】在钢筋对焊工艺中,顶锻速度是指闪光完成后的瞬间将焊口迅速闭合以使焊缝不受( B )的速度。