题目

We were caught in the heavy traffic jam. Otherwise, we _____ on time.   A. would have arrived                        B. arrived   C. must have arrived                         D. should arrive 答案:A有关洛仑兹力和安培力的描述,正确的是A.通电直导线处于匀强磁场中一定受到安培力的作用B.安培力是大量运动电荷所受洛仑兹力的宏观表现C.带电粒子在匀强磁场中运动受到洛仑兹力做正功D.通电直导线在磁场中受到的安培力方向与磁场方向平行
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