我们北京市的大中型轮式拖拉机驾驶员的田间驾驶考试,有一项内容是:倒库挂接农具。考试场地如图,要求拖拉机从标杠①、③之间驶入,在两进两退之内,使拖拉机后部的左、右下拉杆绞接点和假设农具的挂接点A、B连接上。从图上看,并不复杂,可有的人前进、后退,怎么也对不准、挂不上。在练习这个项目时,首先要掌握驾驶拖拉机的基本动作:①坐的姿势端正,眼看正前方,熟悉各操纵机构的位置。②双手握方向盘的位置,以钟表做参考点,左手握在八九点之间,右手握在二三点之间。打方向、回方向要双手交替进行,双手不得同时离开方向盘。打方向盘时,要一次打够,一次回准。③ One of the field driving tests for large and medium-sized wheeled tractor drivers in our city is: Inverting the farm implements. The examination site is as shown in the figure, requiring the tractor to enter between the bracing bars ① and ③, and to connect the left and right lower lever articulation points of the tractor with the attachment points A and B of the assumed agricultural implements within two in and two outages. From the map point of view, is not complicated, and some people can go forward, back, how are not allowed to hang on. In the practice of this project, we must first master the basic driving tractor movements: ① sit posture correction, seeing the front, familiar with the position of the operating mechanism. ② hands grip the location of the steering wheel to do the reference clock to the point of left hand in the eighty-nine point, the right hand between two or three points. Fight the direction, back to the hands alternately, both hands may not leave the steering wheel at the same time. When hitting the steering wheel, you should hit it once and return once. ③