A.伸縮區(qū)B.固定區(qū)C.緩沖區(qū)D.調(diào)節(jié)區(qū)
A.43B.50C.60D.75
A.205.230.255.288mmB.200.205.230.255mmC.205.240.235.288mmD.205.230.260.288mm