单项选择题
A.压接 B.绞接 C.焊接 D.螺丝压接
A.1.3~1.5m B.1.3~1.8m C.1.2~1.5m D.1.5~1.8m
A.100mm B.200mm C.300mm D.400mm
A.不低于2.5m B.不低于3m C.低于3.5m D.高于4m
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