单项选择题
A.200~250mm B.250~300mm C.300~360mm D.350~400mm
A.13mm B.14mm C.15rAm D.16mm
A.1mm B.1.5mm C.2mm D.2.5mm
A.工作风缸 B.副风缸 C.制动缸 D.缓解风缸
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