一道顺逆流问题If a boat leaves dock A for dock B in downstream direction,it takes 4 hours;and if the boat leaves dock B for dock A in countercurrent direction,it takes 5 hours.We know that the water-flow speed is 3km/h,please calculate the spe

一道顺逆流问题If a boat leaves dock A for dock B in downstream direction,it takes 4 hours;and if the boat leaves dock B for dock A in countercurrent direction,it takes 5 hours.We know that the water-flow speed is 3km/h,please calculate the spe 什么是顺逆流问题 一道AP微积分题目A boat is pulled into a dock by a rope attached to the bow of the boat and passing through a pulley on the dock that is 1 m higher than the bow of the boat.If the rope is pulled in at a rate of 1.1 m/s,how fast is the boat appr 关于顺逆流问题的所有公式. If you have any problems ___English ,you can ask your teacher for help(A.lea（A.learning B.to learn C.to learning D.learn)正确答案A，why If I had a lot of money,I ( ) buy a boat.A.willB.amC.would 顺逆流,上下坡行程问题 的公式 take a boat同义词 row a boat中文 sit in a boat a boat on the rowed a boat If I had a lot of money,I _______ buy a boat.A am B will C would 关于新概念英语一道时态问题（救急!）关于2册86课中的1）...They had just had enough time to swim out of danger when the boat again completed a circle. ...中为什么后面一句不加had?即为何不是“when the boat had again lea是什么意思 on a boat 还是in a boat?好像都可以? 是sitting in a boat 还是sitting on a boat? in a boat、on a boat那个对火速!