Manipulator is now used as a industrial robots in use, the control objectives often appear often in industrial automation. Industrial automation technology has gradually matured, as mature a technology line has been rapid development in industrial automation as a separate subject. Manipulator application began to filter into welding, logistics, mechanical processing, and other industries. Especially at high or very low temperatures, full of poisonous gases, high radiation case, robot in similar circumstances showed great use also brings great convenience to the staff. Precisely because of this robot to get peoples attention began to be a high degree of development. Labor rates, working conditions, labor intensive aspects of promoting development. Both at home and abroad to develop the PLC (programmable logic controller) is in various special circumstances and under special conditions set for mechanical devices. Now turned on the development of the microelectronics automatic control technology and the rapid development of the trains, the success of PLC hardware software and simulation control win big and successful development, now continues to develop as a factory automation standards. Because robots are good development of the technology makes a good optimization of productive capital, and robot shows this unique advantages, such as: has good compatibility, wide availability, hardware is complete, and programming that can be mastered in a short time, so in the context of industrial PLC applications became ubiquitous. Manipulator in many developed country agriculture and industry has been applied, such as the use of mechanical harvesting large areas of farmland, repeated operations on the high-speed line that uses a robotic arm, and so on. Today, the high level of automation combined with restrictions on the manipulator development level is slightly lower than the international. The design is mainly arm welding machine by PLC Automation control. This of design let designers on in school by learn of has a must of consolidation, understand has some usually didnt opportunities awareness in world range within some leading level of knowledge has has must awareness, hope designers can in yihou of design in the can success of using in this design in the proceeds of experience 1.2 manipulator in both at home and abroad of research profile automation mechanical arm research began Yu 20th century medium-term, after years with with computer and automation technology of development, Makes mechanical arm on the Grand stage of industrial automation and shine, gradually became an industrial evaluation standards, and its importance can be seen. Now original robotic arm spent most of mass production and use on the production line, which is programmed robotic arm. As the first generation of manipulator position control systems main features, although not back several generations that can detect the external environment, but can still successfully complete like welding, painting, delivery as well as for materials simple movements. Second generation mechanical arms are equipped with sensors and manipulators have the environment there is a certain amount of sense, when the mechanical arm is to use the program as a basis. Difference is that the robot begand更多免费试卷下载绿色圃中小学教育网www.lSpjy.com 分站www.fydaxue.com（北京版）四年级数学下册期末检测试卷班级_姓名_得分_一、我会填：（每空1分，共24分，11题2分）1. 0.36的计数单位是（0.01），它有（36 ）个这样的计数单位。2. 2089360=（208.936）万（209）万3. 把0.576的小数点向右移动两位，再向左移动一位，得到的小数是（5.76），和原来的小数相差（5.184）。4. 8个一，3个百分之一和6个千分之一，组成的数是（8.036 ）。5. 3和0.39合起来是（3.39 ），读作（三点三九 ）。6. 用0、2、3、7这四个数字，组成的最简三位小数中，最小的是（ 0.237 ），最大的是（ 7.302 ）。7. 盒子里有3个白球，2个黄球和一个红球，任意摸一个，会有（3）种可能性，摸到黄球的可能性是（ ）。8. 某天的最高气温是零上8摄氏度，记作（ 8oC ），夜间最低气温是零下3.2摄氏度， 记作（ 3.2oC ）。9. 5.6是一个三位小数的近似数，这个数最大是（ 5.649 ），最小是（5.550 ）。10. 3.07t=( 3070 )kg 6km5m=( 6005 )km 48cm=(0.48 )m 2.08t=( 2 )t( 80 )kg11. 把3.6、3.06、0.36、0.306按从小到大的顺序排列： 0.3060.363.063.6二、判断：对的打“”，错的打“”。（5分）1. 0.6和0.60的大小一样，计数单位也一样。（ ）2. 5.89去掉小数点后，原数就扩大了100倍。（ ）3. 不相交的两条直线叫平行线。 （ ）4. 小数的后面填上“0”或者去掉“0”，小数的大小不变。（ ）5. 如果在盒子里放入3个黄球和一个白球，摸到白球的可能性是。（ ）三、选择：把正确答案的序号填在括号里（7分）1. 把4.6改写成大小不变、以千分之一为单位的小数是（ A ）。 A、4.600 B、4.06 C、40.62. 把一个两位小数的小数点去掉，这个小数就（ B ）。 A、缩小100倍 B、扩大100倍 C、不变3. 在同一平面内，两条直线一定（ A ）。A、相交或平行 B、垂直或平行 C、垂直4. 比2.9大比3小的数（ C ）。A、不存在 B、有一个 C、有无数个5. 请你把观察到的图形的序号填在括号里。（1）从上面看是的有（）；（2）从正面看是的有（）；（3）从侧面看是的有（ ）四、我会算：（20分）1. 竖式计算( 8分) 12.4+8.93= 21.33 80-79.8= 0.2 验算 略33.14-19.76= 13.38 12.77+8.56= 21.33略2. 能简算的要简算。（12分） 63.47-（0.29+3.47） 20.8+0.27+0.23+0.5 =63.47-0.29-3.47 =20.8+(0.27+0.23+0.5) =(63.47-3.47) -0.29 =20.8+1 =60-0.29 =21.8 =59.71 17.26-3.4+0.74-6.6 3-1.284-0.716 =(17.26+0.74)-( 3.4+6.6) =3-(1.284+0.716) =18-10 =3-2