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Boilers operating wjth both forced and ind.uced draft use the forced draft fan to push air through the combustion air supply system into'the.furnace,The fan must have a discharge pressure high enough to equal the total resistance of air ducts,air heater, burners or fuel bed and any other resistance between the fan discharge and the furnace.

锅炉的运行是使用强制通风风机将空气通过空气燃烧供应系统供入炉内。风机必须有足够高的排气压力来平衡输气管、空气加热器、炉膛或燃料箱及输气管到锅炉之间所产生的全部阻力。

The relationship between resistance of still plane bed and energy slope has been proposed from the similarity between sediment incipient motion and still bed resistance.

从挟沙水流的平均能量方程出发，得到了推移质附加阻力的计算公式及悬移质附加阻力计算公式，并对挟沙水流的阻力进行了讨论。

The formulation of JG3 synthetic automobile brake oil is explained. It is verified bytest that this product offers super vapour -- lock resistance under high temperature, good lowtemperature fluidity, corrosion resistance, and rubber gasket non -- solvency . The formula canmeet GB10380--89 standard and the bench tester requirement.

叙述了 JG3合成汽车制动液的配方研制过程，试验证明，该产品具有优良的高温抗气阻性、良好的低温流动性、抗腐蚀性，以及对橡胶皮碗的不溶胀性，该配方已达到GB10830—89标准及台架试验要求。

The control thermal resistance is that of natural convection and thus heat pipe radiator can be simplified as a vertical plate channel heat radiator. The influence of tilt angle to thermal resistance of heat pipe radiator is also discussed in this paper.

该散热器的控制热阻为翅片与空气间的自然对流热阻，其间的传热可简化为倾斜通道自然对流的传热，在竖直平板通道模型的基础上加以翅片倾斜角度的修正。

Group I:Completely resection of the mitral leaflets, chordae and tendineae, and papillary muscles; group Ⅱ:Preservation of the posterior leaflets and subvalvular structures;group Ⅲ:Completely preservation of the mitral complex.4h, 24h and 48h after operation, Swan-Ganz catheter was used to measure hemodynamic index: Mean pulmonary arterial pressure,pulmonary vascular resistance,pulmonary capillary wedge pressure,systemic vascular resistance,cardiac index and left ventricular stroke work index.

组：常规MVR，切除全部二尖瓣瓣叶及其瓣下结构；Ⅱ组：保留后瓣及其瓣下组织；Ⅲ组：全部保留二尖瓣装置。术后4小时、24小时和48小时分别采用Swan-Ganz导管测定血流动力学指标：平均肺动脉压、肺毛细血管嵌压、肺血管阻力、外周血管阻力、心脏指数和左心室每搏作功指数。

Rotary slag resistance method was used to make comparison tests of resistance to oil coke residue erosion of different fractories, such as zirconia brick, high purity corundum brick, chrome-corundum brick, 86 high chrome brick and 90 high chrome brick.

采用回转抗渣法进行氧化锆砖、高纯刚玉砖、铬刚玉砖、86高铬砖和90高铬砖等不同材质耐火材料抗石油焦渣侵蚀能力的对比试验，并采用扫描电镜和X衍射等分析方法对侵蚀试验砖的显微结构进行了观察与分析，研究了不同材质耐火材料抗石油焦渣侵蚀能力的差异。

HP1500 fast patrol boat is our newly developed patrol boat for Coast Guard. Its deep-V hull is as good as abroad advanced hull, with 22 degrees deadrise angle. It has state 6-wind resistance and good sea-keeping. It is the first patrol boat with diesel engine that speed can obtain 50knots in China. As per CCS Construction Regulation, the boat can satisfy the impact resistance at the high speed in wretched sea condition.

本艇是深圳市海斯比船艇科技发展有限公司按边防部队要求全新研制、采用与国外最先进船型相媲美的深V船型、底部斜升角22°，耐波性佳，抗风浪能力为6级，在国内以柴油机为动力的巡逻艇上率先突破50节，结构按CCS《海上高速艇入级与建造规范》设计，满足在恶劣海况下高速航行时的抗冲击要求。

A kind of high speed steel roll collar with high wear-resistance has been developed usingcentrifugal casting technique, to replace common alloy cast iron rolf collar with low wear-resistance and hard alloy roll collar with high price.

常用合金铸铁辊环耐磨性低，而硬质合金辊环成本高，采用离心铸造方法，开发了耐磨性能优良的高速钢辊环，高速钢辊环的硬度达63～65HRC，辊面硬度差小于2HRC，冲击韧性大于16J/cm~2。

this paper basis on the current codes,taking axis compressive resistance concrete column bearing capacity formula as constraint condition., taking cost as objective function, taking reinforcement diameter and concrete strength grade as design variables, giving an optimization design, got the best basic parameters which satisfied application conditions,to provide better calculation for the axis compressive resistance concrete colum design.

本文以现行规范为依据，以混凝土强度理论推导出的轴心抗压混凝土柱的承载力计算公式作为约束条件，以造价为目标函数，以混凝土中的钢筋直径、混凝土强度等级为设计变量，对其进行优化设计得到了满足使用条件下的最优基本参数，为轴心受压混凝土柱的设计提供了较好的计算依据。

The effective output resistance is the parallel combination of the plate load resistor and the plate resistance of the tube.

有效输出电阻实际是屏阻和负载电阻的并联】。

You have to walk your own alk in this life.

次生中你必须走自己的路。

To start with, the thesis analyses ***ism in terms of the generic masculine words, word order and semantic derogation of women in greater detail.

论文首先从阳性词泛指，词序，词义的贬降等方面对英语中的性别歧视现象进行了详细的分析。