We cannot be sure if an internet attack will make a ship sink. Hijackings made by Somali pirates is a top risk for shipping. Many underwriters have made coverages for those shipping to the Arctic. F. Experts is uncertain if an autonomous ship is safer than a manned ship. G. Neil Roberts believes a cyber attack can cause a ship to sink. I. Lloyd’s experts explored several top risks in shipping today. J. The use of autonomous technologies in shipping industry is a tendency. K. Insurance companies need to evaluate the feasibility of covering the Arctic ships L. Chances that attack a ship’s navigation system still exists.
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【简答题】已知圆O:x 2 +y 2 =r 1 2 (r 1 >0)与圆C:(x-a) 2 +(y-b) 2 =r 2 2 (r 2 >0)内切,且两圆的圆心关于直线l:x-y+ 2 =0对称.直线l与圆O相交于A、B两点,点M在圆O上,且满足 OM = OA + OB (1)求圆O的半径r 1 及圆C的圆心坐标; (2)求直线l被圆C截得的弦长.