1979年交通部颁发“公路养护质量检查评定暂行办法”中规定:检查路面平整度,要用三米直尺。但每次当我们使用该尺的时候,因为直尺较长,上下车很不方便。因此有必要改进一下,这里提出我个人的粗浅意见。 (一)将三米直尺改为折尺,1.5米一段,两段接头用铰链和槽形卡套(如图)把它连 In 1979, the Ministry of Communications issued “Provisional Measures for Quality Assurance of Highway Maintenance and Inspection”, which states: Check the smoothness of pavement, use a three-meter ruler. But every time we use the ruler, getting on and off is inconvenient because of the long ruler. Therefore, it is necessary to improve, here put forward my personal opinion. (A) The three-meter ruler into folding ruler, 1.5 m section, two joints with hinges and groove-shaped card sets (pictured) to connect it