A.先上紧最外侧两条螺栓，再上紧中间两条螺栓，剩下两条最后上紧 B.先上紧中间两条螺栓，再上紧最外侧两条螺栓，剩下两条最后上紧 C.先上紧中间两条螺栓，其余4条依次上紧 D.先上紧最外侧两条螺栓，再上紧次外两条螺栓，最后上紧中间两条螺栓
A.10m B.15m C.20m D.25m
A.80mm B.100mm C.110mm D.120mm
A.±80mm B.±160mm C.±100mm D.±120mm
A.10mm B.8mm C.6mm D.4mm
A.2mm B.4mm C.6mm D.8mm
A.伸缩区 B.缓冲区 C.伸缩区和缓冲区 D.固定区
