单项选择题
A.100mm B.110mm C.115mm D.120mm
A.710±5mm B.715±10mm C.715±5mm D.720±5mm
A.丢失时补装，螺栓松动时紧固 B.丢失时补装，螺栓松动时点焊 C.丢失时补装，螺栓松丢失时补装 D.丢失时补装，螺栓折断时更换
A.头部6mm，中部6mm B.头部8mm，中部8mm C.头部10mm，中部6mm D.头部10mm，中部8mm
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