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路程总是包含三项变量,即路程(s)、时间(t)、速度(v).其基本关系式为v=s/t.这三项变量中,如已知两项,即可求得另一项.由于路程、时间可分段,速度有
The route always contains three variables, namely, distance (s), time (t), and speed (v). The basic relation is v=s/t. Of these three variables, if two are known, you can find Another one. Due to distance, time can be segmented, speed is