题目

完形填空Information of the patient was checked. The shadow less lamp was on. All supplies needed for the operation were 1 . This was a typical 2 of a surgery. However, there was one more 3— a piano. It was the first time ever in the world that a piano had 4 the operating room. My 15 colleagues and I were operating on a 10-year-old patient.Occupyinga comer of the room, the grand piano was performed by Emiliano, a musician. Tothe 5 background of a piano played 6,we performed the surgery to remove a tumor(肿瘤)from the boy's stomach. Everything went well. There was no complication. Amagic如图所示，质量相等的三个物块A、B、C，A与天花板之间、B与C之间均用轻弹簧相连，A与B之间用细绳相连，当系统静止后，突然剪断AB间的细绳，则此瞬间A、B、C的加速度分别为（取向下为正）（ ）A．﹣g、2g、0 B．﹣2g、2g、0 C．﹣2g、2g、g D．﹣2g、g、g