By the dissecting of the guality in testing low level light commanding instrument C 2 group of chief artillermen, the defects in existing tightness testing method is analyzed, pointing out that the air tightness testing and the water tightness testing of optical products with special structure are not equivalent and can not be sub stituted.
通过对炮长微光指挥镜Ｃ２组试验中质量问题的解剖，分析了气密性检查方法的缺陷，特殊结构的光学产品气密性检查和水密性检查不能等效代替，并提出了改进产品的密封质量的措
Integrated industrial wall board system watertight performance test
集成工业化住宅外墙板系统水密性能实验
Influence of sealed water-based waterproofing agent on concrete's capability
浅谈水性密封防水剂对混凝土性能的影响
Inspection installation and water tightness transducer of echo sounder on berth.
测深仪换能器船台安装和水密性检查。
Numerical Simulation Study of Helical Seal on Water-lubricated Hydrostatic Bearings
水润滑轴承螺旋密封性能的仿真分析
Energy density effects on propulsive characteristics of water propellants for laser propulsion
能量密度对水工质激光推进性能的影响
Spiral wound gaskets test method of hydraulic pressure sealing characteristics
GB/T4620-1984缠绕式垫片水压密封性能试验方法
CANDU-6 Reactor Building Integrity Leak Rate Measurement Research;
重水堆安全壳整体密封性能测试技术研究
Research and Development of the Experiment System for Water Lubricated Dynamic Pressurize Bearings;
水润滑动密封轴承性能实验系统的研究与开发
Researches on the Mechanism and Properties of High Temperature Resistant Water-Based Drilling Fluids with High Density
抗高温高密度水基钻井液作用机理及性能研究
Study on the Thermal Performance of Packing in the Closed Counterflow Cooling Tower
逆流密闭式冷却塔淋水填料层热工性能的研究
Simulation of the Cooling Tower Packing's Thermal Performance in Closed Type Cooling Tower
逆流密闭式冷却塔中淋水填料热工性能模拟
Dense Framework Type of Cement Stabilized Macadam Anti-crack Property
骨架密实型水泥稳定碎石抗裂性能分析
Shrinkage of cement stabilized macadam base course
骨架密实型水泥稳定碎石基层的收缩性能
RESEARCH ON ANTI-CHANNELING PERFORMANCE OF LOW-DENSITY AND IMPERVIOUS LATEX- CEMENT SLURRY
低密度非渗透胶乳水泥浆防窜性能研究
Research on Sealing Performance of Underwater Skirt Pile Gripper for Offshore Oil Platform
海洋石油平台水下夹桩器密封性能研究
For watertight bulkheads, how do you check the watertightness?
就水密舱壁而言，怎样检查其水密性？
Flexibility and hosing test for small water tight hatch cover( water tight door and window).
水密小舱口盖（密门、）闭灵活性、水检查。
The most important part of air-gun source is controller.
尤其在水产丰富、殖密集的水域施工,更能显示其优越性。