钢制的

She could have understood the meaning of a little stone-cutter's yard at Columbia City, carving little pieces of marble for individual use, but when the yards of some huge stone corporation came into view, filled with spur tracks and flat cars, transpierced by docks from the river and traversed overhead by immense trundling cranes of wood and steel, it lost all significance in her little world.

她能理解哥伦比亚城那个小采石场的性质，它是把大理石切割成小块出售给私人。但是当她看到巨大的石料公司的采石场，看到里面纵横交错的铁路专线和平板车，穿入石场的河边码头，和头顶上方的木制钢制大吊车，她就莫明其妙了。她没有见过世面，当然不明白这些东西的性质。

The Chinese Standard Compressing Garbage Truck was firstly developed and manufactured in the beginning of 2001. Now, we have 5 grades and 8 categories of rear-loading compressing garbage truck which was modified from the chassis with loading capacity of 3T～15T. The truck frame was made of high strength steel and is controlled by advanced PLC programmable controller. It is of reasonable structure, simple operation, safety and reliability, low noise and low fuel consumption. Basically, it has no secondary pollution, and awarded many patents. The primary technological performance of the truck is at the advanced level compared to similar domestic products. The series provide various loading methods, suitable for the collection and transportation of barrel-packing, bag-packing and no-packing living garbage in urban residential areas.

h， C _9 d# U' e4 O 中标牌压缩式垃圾车系列产品自2001年初开始研制、生产，目前已拥有采用装载量3T～15T的汽车二类底盘改装的五个级别八个品种的后装压缩式垃圾车，整车采用高强度钢制作和先进的PLC可编程序控制器控制，具有结构合理、操作简便、安全可靠、噪声低、油耗少的特点，基本杜绝了二次污染，并拥有多项专利，其整车的主要技术性能处于国内同类产品先进水平，该车系可提供多种上料方式，适用于城镇居民桶装、袋装和散装生活垃圾的收运。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。