题目

Many people like to travel by plane, but I don't like it because an airport is usually far from the city. You have to get there early and wait for hours for the plane to take off and it is often late. You can't open the window. You can't choose the food. Planes are fast, but they still take hours to get out of the airport and into the city.I like traveling by train. I think trains are safe. Railway stations are usually in cities. When you are late for a train you can catch another one .You can walk around in the train and open the windows. You can see many interesting things on your way. I kno1．在“探究求合力的方法”的实验中，实验之前先检查了弹簧秤，然后进行实验：先将橡皮条的一端固定在水平放置的木板上，另一端系上带有绳套的两根细绳．实验时，需要两次拉伸橡皮条，一次是通过两细绳用两个弹簧秤互成角度的橡皮条，另一次是用一个弹簧秤通过细绳拉橡皮条．（1）在操作过程中，对减小实验误差有益的说法有BC（填字母代号）A．两细绳必须等长B．弹簧秤、细绳、橡皮条都应与木板平行C．拉橡皮条的细绳要长些、细点、标记同一细绳放行的两点要远些D．用量弹簧秤同时拉细绳时两弹簧秤实数之差应尽可能大（2）如图1所示，每根细绳分别连着一个量程为5N、最小刻度为0.1N的弹簧测力计，沿着两个不同的方向拉弹簧测力计，请从图中读出水平弹簧秤拉力大小为4.00N（3）如图2是文文同学研究合力与分力关系时在白纸上画出的图，根据物理作图要求和规范，请出图中存在的错误．合力与两分力没有按统一标度一段一段表示出来、F1、F2与F之间应该用虚线（写出两个即可）