单项选择题
A.22.2mV/mm B.23.2mV/mm C.24.2mV/mm D.25.2mV/mm
A.5MPa B.10MPa C.15MPa D.20MPa
A.180mm B.200mm C.240mm D.280mm
A.30mm B.40mm C.50mm D.60mm
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