| 1. | Machine tools ; multi - spindle heads ; covers types a and b
机床.多轴头. a型和b型罩 |
| 2. | Covers type conversions from the
介绍如何将类型从 |
| 3. | Effects of land - cover types on sediment yield in the three - gorge region of yangtze river
长江三峡库区土地覆被类型对坡面产沙的影响 |
| 4. | Half covered type
半蓬货车 |
| 5. | 25 mm 500 mm mounting dimensions for hydraulic cylinders - part 1 : single rod - 16 mpa series , round cover type with welded or threaded flange bores from 25 mm to 500 mm
液压气缸的安装尺寸.第1部分:单杆. 16 mpa系列焊接或螺纹法兰的圆盖型液压气缸 |
| 6. | 50 mm 500 mm mounting dimensions for hydraulic cylinders - part 4 : single rod - 25 mpa series , round cover types with welded or threaded flange bores from 50 mm to 500 mm
液压气缸的安装尺寸.第4部分:单杆. 25 mpa系列焊接或螺纹法兰的圆盖型液压气缸 |
| 7. | The concepts of heterogeneity and homogeneity are scale - dependent . we describe nine plant - climate covers type landscape components or processes across a broad landscape for the possible response to climate change
不同尺度、干扰频率、响应速率的生态过程作用于绿洲-荒漠生态系统，其异质性格局被整合到多维等级的空间缀块动态范式上。 |
| 8. | We , then , parameterized a semi - empirical model for the different land surface cover types . this semi - empirical model was applied to minimize the effects of the vegetation volume scattering and extinction in radar measurements
此外，目前星载合成孔径雷达如ers - 1 2 、 radarsat等均为单一频率、单一极化的雷达，无法从得到的单参数雷达后向散射系数中直接提取地表土壤水分信息。 |
| 9. | Results show that qaidam mountain desert region has the highest average ecological risk value 4 . 2585 , followed by guoluonaqu alpine scrub meadow region 2 . 7640 and qinghai and qilian mountain steppe region 2 . 7335 among these ecosystems alongside qinghai - xizang highway and railway through six natural regions . as far as land cover types are concerned , the top three ecological risk values appear in the needle - leaved forest 4 . 3096 , desert ecosystem 4 . 1174 and land without vegetation 3 . 6182 respectively , which are higher than those in the other seven land cover types in the study site
评价结果显示：青藏公路铁路沿线生态系统所跨越的6个自然区的平均生态风险值居前3位的是：柴达木山地荒漠区4 . 2585 ，果洛那曲高寒灌丛草甸区2 . 7640青东祁连山地草原区2 . 7335沿线10种植被生态系统平均生态风险值居前3位的是：针叶林生态系统4 . 3096荒漠生态系统4 . 1174和无植被地段3 . 6182 。 |
| 10. | Aiming at the ecological environmental deterioration of bashang , from 2002years to3 ~ 5months of 2003 years . sand - transporting quantity of land cover types were on - the - spot moinitoring in gale seaon , comparing the productivity of the main crops . improving environment and developing economy are compositively considered for applying returning cultivated to woodland and grassland to supply the base of theory and technology . the main results as following : 1 observing the sand transporting quantity of artificial grassland , stubble land and cultivate land . indicates that when wind speed is higher ( 8 . 0m / s ) , the sand transporting quantity of artificial grassland of 200cm reduces 35 . 5 % in average more than that of cultivate land , 34 . 5 % sand - transporting quantity than that of stubble land . no distinct difference between stubble land and cultivate land . and when wind speed is lower ( = 5 . 0m / s ) , the sand - transporting quantity of coverage is no distinct difference according to the analysis of variance
从改善环境和发展经济两方面综合考虑，为实施坝上地区“一退双还”提供了理论与技术依据。主要研究结果如下： 1对人工草地、作物留茬地及耕翻地的输沙量观测表明：劲风( 8 . 0m s )下，人工草地比对照耕翻地输沙量在200cm高度内平均降低了35 . 5 ，比作物留茬地平均降低了34 . 5 ；作物留茬地输沙量与耕翻地差异不显著；微风( 5 . 0m s )下，不同地表覆被类型对输沙量的影响差异不显著。 |
