目的探讨轻比重液腰硬联合麻醉用于老年患者下肢手术的有效性和安全性。
Objective To discuss the feasibility and safety of using specific gravity bupivacaine in combined spinal and epidural anesthesia in aged patients undergoing lower extremity surgery.
胶体电池的电解质呈固态，密封结构，凝胶电解液，永不漏液，使电池内每一部位的比重保持一致。
Gel battery electrolyte and solid, sealing structure, gel electrolyte, never leakage, to keep the proportion of each part.
镀液比重：基本上比重低，药水导电差，电镀效率差。
Solution: basically, the proportion of lower proportion potion is poor, poor efficiency conductive plating.
报房蓄电池组电解液比重小于1.285。
结果表明，连续液相烧结得到的钨基高比重合金板密度在烧结试样行进方向上产生梯度分布。
The results showed that the density of the plates was in graded distribution in the moving direction of samples during sintering.
充气泡沫泥浆由于比重低，液柱压力低，实现了负压钻进，能大幅度提高机械钻进，延长钻头寿命。
The aerated foam mud fluids can used in negative drilling, and enlarge the life of drilling bits for its low density, and low sap pressure.
培养液比重、温度及光照条件的改变短期内对细胞形态类型的转变没有明显影响；
The effect of short-period changes in water salinity, temperature and light intensity on the conversion of morphotype was not notable.
系统采用气提这一简单可靠的排砂方式，依靠气水混合液与水之间的比重差将砂粒排出。
Simple and reliable, the system takes the method of air-lift to remove the grit, taking advantage of the proportion difference between air-water mixture and water.
重介质旋流器的介质为高密度悬浮液，在离心力的作用下，矿物主要在重介质旋流器中按比重分离。
The medium of is suspending liquid with high density. Under the action of centrifugal force the minerals are separated according to their specific gravity in the heavy medium cyclone.
试验表明：酸浓度的增加导致有机含量减小，土粒比重减小，塑限增大、液限减小；
It was shown that the organic content, the specific weight of soil particle and the liquid limit decreased but the plastic limit increased with the increase of the concentration of acid.
蓄电池维护工作比较简单，做好电解液的补充、蓄电池和极桩的清洁和蓄电池的比重控制等工作，就能有效的延长蓄电池的使用寿命。
Battery maintenance work is relatively simple, do a good job of electrolyte supplement, battery and pole cleaning and battery weight control, etc.
蓄电池维护工作比较简单，做好电解液的补充、蓄电池和极桩的清洁和蓄电池的比重控制等工作，就能有效的延长蓄电池的使用寿命。
Battery maintenance work is relatively simple, do a good job of electrolyte supplement, battery and pole cleaning and battery weight control, etc.
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