单项选择题
A.20mm B.30mm C.40mm D.25.50mm
A.3mm B.2mm C.1mm D.0.5mm
A.22.2mV/mm B.23.2mV/mm C.24.2mV/mm D.25.2mV/mm
A.5MPa B.10MPa C.15MPa D.20MPa
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