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两次地震:震中1在 (0, 0) ,影响范围100 km;震中2在 (120, 0) ,影响范围150 km。两个边界方程。同时受两次震动的点?
两次地震:震中1在 (0, 0) ,影响范围100 km;震中2在 (120, 0) ,影响范围150 km。两个边界方程。同时受两次震动的点?
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