单项选择题
A.1.5% B.2.5% C.2% D.3%
A.±1.5mm B.±1.2mm C.±1.0mm D.±1.6mm
A.±2mm B.±lmm C.±1.5mm D.±2.5mm
A.78.5% B.85.5% C.82.5% D.87.5%
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