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砌墙砖试验方法（GB/T2542-2003）标准中规定高度应在砖的两个（）的中间处分别测量两个尺寸。当被测处有缺损或凸出时，可在其旁边测量，但应选择不利的一侧。精确至（）。
A . A、大面1mm
B . B、条面1mm
C . C、大面0.5mm
D . D、条面0.5mm
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