单项选择题
A.530mm*1000m B.540mm*1000m C.550mm*1000m D.560mm*1000m
A.497.5mm*1000m B.498.5mm*1000m C.499.5mm*1000m D.496.5mm*1000m
A.550mm*400m B.550mm*200m C.560mm*200m D.560mm*400m
A.312.5±0.5mm19±0.5mm B.312.5±0.5mm20±0.5mm C.311.5±0.5mm19±0.5mm D.311.5±0.5mm20±0.5mm
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