题目

—Do you know the meaning of the new word? It puzzles me a lot. —I’ve no idea. But I think you can look it up in          . A. stationery                   B. magazine                  C. dictionary              D. documentary 答案：C下列给定的物理量中运算法则满足平行四边形定则的是A．速度变化量B．位移C．速度变化率D．时间