单项选择题
A.100%额定荷载 B.110%额定荷载 C.105%-定荷载 D.125%额定荷载
A.±2.5mm B.±3mm C.±3.5mm D.±1.5mm
A.0.2mm B.0.3mm C.0.4mm D.0.5mm
A.±1mm B.±2mm C.±3mm D.±5mm
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