• 2022-06-09
    阅读蝴蝶阀装配图,其开关阀门时各零件的先后动作顺序是: [img=751x577]180374da689c8bd.png[/img]
    A: 12-7-8-4-2
    B: 10-9-8-4-2
    C: 11-12-9-4-2
    D: 9-7-8-4-2