单项选择题
A.700mm B.720mm C.760mm D.800mm
A.18mm B.20mm C.31.8mm D.35.4mm
A.100+10kpa B.100±10KPa C.110+10kpa D.110+13kpa
A.150N/mm B.180N/mm C.210N/mm D.240N/mm
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