题目

More often than not, the person sitting next to you on a plane or sleeping in the next hotel room has paid more or less than you did for the same services. Each day, airlines give more than several hundred fares (票价) for flights between the same two cities and hotels charge different rates for the same room. So how do you find the best rates? Here are some tips: ▲ Sign up for fare special e-mails. When airlines get into a fare war, the cost of a plane ticket can fall overnight and the discounted fare may be sold out by noon the next day. Get on the mailing list of airlines and ot在图中，用60N水平向右的力匀速推动重120N的物体，试画出该物体所受力的示意图．