題目列表(包括答案和解析)
小船在靜水中的航速為0.5m/s,水的流速為0.3m/s,河寬120m.則小船以最短時間渡過河所需時間和以最短路徑渡過河所需時間分別為( )
A、300s,400s B、400s,240s C、240s,400s D、240s,300s
A.300s,400s | B.400s,240s | C.240s,400s | D.240s,300s |
A.300s,400s | B.400s,240s | C.240s,400s | D.240s,300s |
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