题目

用同一回旋加速器分别对质子和氘核加速后（）A.质子获得的动能大于氘核获得的动能B.质子获得的动能等于氘核获得的动能C.质子获得的动能小于氘核获得的动能D.无法判断 答案：A【试题分析】If she __________ the difficulty, she will tell us.A. overcome B. come overC. overcomes D. overcame