单项选择题
A.200mm B.300mm C.400mm D.500mm
A.+5mm，-3mm B.+5mm，-5mm C.+8mm，+3mm D.+8mm，-5mm
A.裂缝宽度不大于0.25mm B.裂缝宽度不大于0.2mm C.裂缝宽度不大于0.15mm D.裂缝宽度不大于0.1mm
A.15mm B.20mm C.25mm D.30mm
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