• 2022-05-29
    上题中,小环相对平衡的条件为:
    A: [img=53x39]1802f982b71a76f.png[/img]
    B: [img=62x39]1802f982bea3da8.png[/img]
    C: [img=62x39]1802f982c6dd474.png[/img]
    D: [img=62x39]1802f982cf51b62.png[/img]