一只小青蛙吃蛇的故事

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一农人与蛇
一天,一赣洲农人去水田边用镰刀割疯长的野草.随着农人抡圆臂膀,镰刀如雪蝶翻飞在草丛中所向披靡,野草倒如势竹.
酷夏熬热,汗珠子滚太阳.
正当挥汗如雨的农人割的正起劲,感觉手中抓住割断的野草中夹杂的一活物在蠕动.低头细看时,心里掠过一阵寒风.手中左右摇摆的是一纤细鲜嫩的蛇的断尾,横截面处还缀着血珠.
吗呀!农人丢掉蛇尾,撒腿就跑.
时间如电,无辜伤害蛇的事情被农人就着米饭给吞到肚子里忘记了.
来年夏,农人在山坳里的薄田里种了半亩西瓜.以防西瓜不测,夏夜,便在挂了破蚊帐的瓜庵棚里住下.
农人在夜风的吹拂下睡的很舒坦.
第二天清晨,农人被蚊帐轻微的摇动给惊醒.睁开干涩的眼睛感觉一根粗大的活绳子在蚊帐顶部摇摆.再用手习惯揉揉迷蒙的睡眼.盯睛时,原来是条吊在蚊帐顶端的蛇.
带着一身冷汗,农人在手肘的帮助下,匍匐着从庵棚撤出仰着的身体.等退出是非之地,战战兢兢地站起身体,才得知事情的蹊跷.
这条吊挂着的蛇是去年被农人割草时,被镰刀误伤过.它身体的后部的镰伤,淤积成一球壮硬物.在农人熟睡时从蚊帐顶部的破洞里钻进借机实施报复,因洞小,蛇尾部拖着的球壮硬物大,身子被吊在蚊帐顶端,使偷袭成为泡影.he ultrasonic wave automobile back-draft detector is one kind auxiliary unit that can display the condition of the obstacle behind the vehicle in real time.It applies extremely widely in the real life.In this paper,according to the transmission reflection theory of wave in the air,using supersonic transducer as interface unit and applying monolithic machine techniques to design a series of bus ultrasonic measuring system.
This paper introduces the design of ultrasonic range system in Back Car based on microprocessor.The microprocessor control the time and transmitting and reflecting back of ultrasonic,the distance can measure through calculating the speed of ultrasonic in car, and use the temperature compensation amendment in the data of the speed processing.The system can alert according to the changing distance, the distance could be displayed on real time as well.
This paper summarizes the development and fundamental principle of ultrasonic
detection. And then the transmission, receiver, detection, displays chime of this distance meter system is brought out. Starting from the performance demand and requirement of utility,the opinion is to choose the system component,testing theory and methods,design both the hard and soft ware.It describes the hardware design of the system in detail,and provides the procedural flow chart of software design.It explains the applied function of the system through the error analysis.
Key words: ultrasonic distance measurement microcomputer。