2019年12月六级真题(第三套)阅读 Section B I know he likes wine, but I don’t know whattype. 2018年6月六级真题(第二套)听力 Section A In 2001, for example, the Environmental Protection Agenc restricted thetypeand amount of lead that could be present in paint and soil to homes and child...
Gasoline Soil Tamping Compact Rammer with Factory Price Product Uses: Electric tamping rammer is suitable for the traffic, municipal works and construction sectors with unique functions to tamp the road shoulder, bridge surroundings, pavement of the street. Product Description: Low co...
CAST IRON SOIL PIPE (HUBLESS TYPE) 1. Size:1.5'-15" 2.material: grey cast iron 3. for water drainage 4. UPC approva PART NO. Size Inside Diameter Outside Diameter Barrel Thickness, T Laying Length, LB PC/Pallet B J Nominal Minimum 10 ft ± 0.50 in. (3.0480 m ±13 mm) ...
Hydraulic rock breaker is powered by an excavator or loader pump provides pressure oil, it can dig a fundamental role in building a more efficient clean up floating rock crevice in the rocks and soil. Optional hydraulic hammer excavator model is based on...
作者:G Ren,Z Shang,R Long,Y Hou,B Deng 关键词: salinity, biomass, Stellera, vegetation cover, soil water, clay, sand, nutrient content, grasses, Oxytropis, bulk density, ecosystems, edaphic factors, Aconitum, alpine meadows, Ligularia 被引量: 23 ...
We also conclude that subtropical forest soil δ15N is affected by the high rate of atmospheric N deposition. This is a preview of subscription content, log in via an institution to check access. Similar content being viewed by others Patterns of δ13C and δ15N in soil profiles under ...
Therefore, agricultural soil was more appropriate to use as a backfill soil in slope revegetation practice than was the rock fragment, which was helpful for decreasing the environmental risk of Cd and Pb on the slopes. (c) 2019 Elsevier B.V. All rights reserved. 展开 ...
The community structure of both AOB and AOA in all paddy soils was different from each other. Conclusions The population size and community structure of AOB and AOA in the flooded paddy soils were mainly determined by the soil types, irrespective of rice-planted or unplanted. This is a ...
Recent studies on water retention behaviour of biochar amended soil rarely considers the effect of pyrolysis temperature and also feedstock type into account. It is well known that pyrolysis temperature and feedstock type influences the physical and chem
The soil organic matter, soil labile organic matter and soil carbon management index(CMI) at different land use conditions in Ziwuling area were studied. The objective was to reveal changes of soil organic matter fraction and their corresponding carbon management indexes as affected by land use pat...