400-600-1123
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答案：
B
条件1可
ST=56，SU=75，UT=69，那么三角形STU可以固定。T点的位置固定。
RS=28，说明R在S为圆心，半径28的圆1上。
RU=62，说明R在U为圆心，半径62的圆2上。
那么R是圆1和圆的交点，有2个交点。RT也有两种可能值，所以不确定的。
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