单项选择题
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
A.308±0.5mm20±0.5mm B.307±0.5mm20±0.5mm C.308±0.5mm19±0.5mm D.307±0.5mm19±0.5mm
A.492.5±0.5mm18±0.5mm B.493.5±0.5mm18±0.5mm C.492.5±0.5mm17±0.5mm D.493.5±0.5mm17±0.5mm
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