单项选择题
A.200mB.200m2C.1000mD.1000m2
A.0.45m±0.02mB.0.55m±0.02mC.0.60m±0.02mD.0.50m±0.02m
A.1B.2C.3D.4
A.≥48B.≥36C.≥72D.≥24
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