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7.处于推顶状态中(如图6所示)的两钩实现面接触的条件及最大接触线长度L在乙钩舌上作一与Y轴成■2=34°的
7. The condition of the two hooks in the erected state (as shown in Fig. 6) and the maximum contact line length L are made on the B side of the hook with the Y-axis ■ 2 = 34 °