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【单选题】
图示为作用在刚体上的四个大小相等且互相垂直的力 (F 1 , F 2 , F 3 , F 4 ) F 1 = F 2 = F 3 = F 4 = F 所组成的平面任意力系,其简化的最后结果为A.
过 A 点的合力
B.
力偶
C.
平衡
D.
过 O 点的合力
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皮皮学刷刷变学霸
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【简答题】粗牙普通螺纹,大径24,螺距3,中径公差带代号为 6g ,左旋,中等旋合长度,其螺纹代号为 ,该螺纹为 螺纹。
【单选题】You ____ right, but ____ you are wrong. [ ]
A.
maybe; maybe
B.
may be; may be
C.
may be; maybe
D.
maybe; may be
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