Resilient floor coverings - determination of mass per unit area of a reinforcement or a backing of polyvinyl chloride floor coverings 弹性地面覆盖物.聚氯乙烯加强板或背衬的单位面积质量的测定
Resilient floor coverings - polyvinyl chloride floor coverings on jute backing or on polyester felt backing or on polyester felt with polyvinyl chloride backing - specification 弹性地面覆盖物.有黄麻衬或聚酯毡衬或聚酯树脂和聚氯乙烯衬的聚氯乙烯地面覆盖物.规范
When the truckdriver from quebec arrived with an 18 wheeler of mulch and i began conversing in near - flawless parisian french about his long journey and breakfast of croissants , my boss ' s eyes lit up 当一辆满载地面覆盖物的18轮大卡车从魁北克开来的时候，我开始用近乎纯正的巴黎法语跟司机聊起他的旅程和羊角面包的早餐，这时老板的眼睛一下亮了起来。
Developing degree ( coverage or thickness ) of coverage layer close to ground is the adequate and necessary condition of anti - erosive effective communities , so coverage close to ground is also the ultimate essential characteristic more common for them 贴地面覆盖层的发育程度(盖度或厚度)是防蚀有效植被的充分必要条件，贴地面覆盖因而也是其更为一般的基本本质特征。
It is important to form coverage close to ground for soil and water conservation by vegetation , and it is a key to soil and water conservation by vegetation to promote development of coverage layer close to ground or pay close attention to changes of it 植被保持水土重要的是应具有贴地面的覆盖层，促进贴地面覆盖层的发育或关注贴地面覆盖层的变化是植被保持水土的关键。
Based on the above conclusions about anti - erosive vegetation structure , the paper expounds the implication of anti - erosive vegetation by pointing out the fault of its current definitions , and it is considered that anti - erosive vegetation should aim at protecting soil from erosion and fixing active sands in the eroded areas , ground space fully occupied by plants , in general with close structure , especially with outstanding coverage close to ground by organic matter ( litter and / or biomass ) 在上述结论的基础上，本文通过指出现有防蚀植被定义的缺陷，论述了其涵义，认为防蚀植被应当是在侵蚀地区，以防止土壤侵蚀或以固沙为目的，植物充分占据地面空间，一般具紧密结构，或者显著具有有机体(枯落物以及生物量)贴地面覆盖特征的植被。
Satellite mission is a very complicated project . the most important part of satellite mission is orbit subsystem . the orbit subsystem is also the base of satellite applications . thus , we must evaluate the relationships between the orbit and the earth coverage , the payload , the data system , the power system , the resource system , the launch place , etc . , 正是由于轨道的重要性，轨道的设计就必须全面考虑，评估和卫星应用有关的地面覆盖、有效载荷、数据系统、电源系统、能源系统、发射场等等和轨道的关系，从中找出最佳的轨道设计方案。
A polarimetric sar combines both advantage of measuring full complex scattering matrix for each resolution cell in a scene and producing two - dimensional high resolution images , and is thus playing a more and more important role in gathering the detailed information regarding the geometric and electric structures of surfaces and covers for application in both civil and military areas 极化合成孔径雷达（ sar ）具有可以测量场景中每个分辨单元的全极化散射矩阵以及产生二维高分辨力图像的两大优点，因此无论在民用和军用的采集地表或地面覆盖物的物理和电磁结构信息的应用中起着越来越重要的作用。
But on the later condition the trend of accumulation turned to be stable in the w3 treatment ( vseawater / v pure water = 1 ) - in root zone soil , variation of sar value accorded with total salt accumulations and sometimes decreased at the treatment where the v seawater / v pure water > 1 . contents of cl - and na + which were the main ions and leached obviously in 0 - 60cm soil were greatly influenced by rainfall , but the rainfall did not affected the contents of ca2 + , mg2 + and k + whose ability of leaching is worse than that of cl - and na + in the root zone soil obviously . the vertical distribution of salt ions in the 0 - 60cm soil were mainly affected by the ratio of v seawater / v pure water in the irrigation water on the condition of not enough rainfall , but on the cont 海水灌溉下，耕层土壤中盐分含量受降雨量影响很大，足够的降雨条件下，盐分不会积累，降雨量较低时，盐分积累明显，但在50海水处理下趋于平衡状态；耕层土壤sar值的变化情况和盐分含量变化情况相一致，在灌溉水中海水浓度大于50时有所下降；土壤中主要盐离子为cl ~ -和na ~ + ， 0 - 60cm土层内， na ~ + 、 cl ~ -明显的向土壤底层迁移，其在土壤中的含量受降雨影响显著，而ca ~ ( 2 + ) 、 mg ~ ( 2 + )和k ~ +在土壤中迁移能力较低，其含量受降雨影响较小； 0 - 60cm层次土壤盐分的纵向分布在降雨量较低的条件下主要受灌溉水中海水浓度的影响，而在降雨充分的条件下，地面覆盖程度成为重要的影响盐分和水分胁迫下菊芋的生理响应及其海水灌溉研究因子之一。
