Thereby measures for improvement are put forward : ( 1 ) adopting a small wheel to replace the steel ball of the ball type unit to ensure more reliable motion of the creeping device ; ( 2 ) applying expansible metallic ring replacing the step - by - step teeth on tooth type unit ; ( 3 ) fixing a sensor in the reversing device for obtaining the information of motion and wear of the creeping device 为此，提出改进措施： 1 .对球型步进式清蜡器采用带穿轴的小轮代替钢球，可使爬行器运动更可靠； 2 .对齿型步进式清蜡器，采用可胀紧金属环代替步进齿，金属环依靠抽油机的冲程力胀大后使爬行器固定，反冲程力使金属环缩小； 3 .将传感器装在换向器内，根据信号的时间间隔判断爬行器的运行速度及磨损等情况。
The easy - fold feature on the third row and fold - flat capability for both second and third rows should be very practical and the large hydraulically assisted tailgate with wide aperture makes the big boot area easy to load ( for light shopping , the remote control operated tailgate glass is a real boon , opening without the need to unlock the rest of the vehicle ) 第三排座位可轻易折起,第二排和第三排座位也可水平放倒,很实用.液压助力的大后风挡有着很宽的孔径,可轻易装载大件货物. (如果装小件货物,可以遥控后风挡,无需开启其它部件)
The paper puts forward the structure of debris - retaining works system , layout consideration and construction principle for the coarse sand concentrated coming area , time sequence of the works construction of " large - scale first and small - scale second " , " downstream first and upper stream second " , and " carrying out section by section " and some problems demanding prompt solution according to the present facts and ; to speed up the preparation of a large - scale debris - retaining reservoir ; to draft the standards for a large - scale debris - retaining reservoir as quick as possible and ; lay emphasis on the schedule of various projects and correct understanding and fully playing the function of key dams through the analysis on achievements and problems of debris - retaining works building and combining with the gully characteristics of coarse sand concentrated coming area 摘要通过对粗泥沙集中来源区拦沙工程建设成就与问题的分析，结合粗泥沙集中来源区沟道特征，提出了粗泥沙集中来源区拦沙工程体系的构成、布局思路、建设原则，提出了“先大后小” 、 “先下后上”和“分段实施”的拦沙工程建设时序，并针对当前工作实际，提出了亟待解决的几个问题：加快大型拦泥库前期工作步伐、尽快制定大型拦泥库标准、重视各类工程实施进度以及正确理解和执行规范、充分发挥骨干坝的作用等。
