单项选择题
A.3~5cm B.6~8cm C.8~10cm D.11~12cm
A.2% B.2mm C.2cm D.2‰
A.上下顺直 B.上下基本顺直 C.偏差不超过1/4砖 D.偏差不超过lCm
A.600mm B.900mm C.l000mmn D.1200mm
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