单项选择题
A.1570MPa B.1670MPa C.1700MPa D.1870MPa
A.Engineering Ropeway B.Cable and Rigging C.Cableway Yarders D.Carriages and Affiliated Equipments of Cableway
A.YJ3型绞盘机 B.QJ-11轻型绞盘机 C.SJ-23型绞盘机 D.闽林821型绞盘机