square ; square ruler
测量用直角尺 measuring square
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分析计算证明，采用改进后的测量方法，则可以用直角尺或线锤测量出准确的钢管管端切斜尺寸。
Analytical calculation shows that thanks to the improved measurement method, the pipe end squreness can be precisely checked by either the steel square or the wire weight.
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