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Constructional character and problems in coiled steam air heater of coal-fired boilers is analyzed and a thinking of new type of tube in tube air heater is proposed.Some practical problems in design and production of the new type air heater are discussed.

对燃煤锅炉原有盘管式暖风器结构特点及存在问题进行了分析，提出了新型套管式暖风器的设计思路，探讨了新型套管式暖风器设计制造过程中的几个具体问题。

For long time ,the designers of recovery boiler usually do not set up inside air preheater for the soda recovery boiler in which reed pulp,bamboo pulp and wood pulp black liquor is burnt due to ash accumulation,the hot air for combustion is supplied by steam air heater outside the boiler.

长期以来，在碱回收炉的炉型设计中，由于积灰的原因，对于燃烧苇浆、竹浆、木浆黑液的碱炉通常不设置炉内空气预热器，燃烧所需热风由炉外蒸汽空气加热器供给。

On the basia of hardworking to overcome the techinical difficulties ,we have presented our key products ----air float-type lawnmower 、 air blower 、 fertilizer spreading machine 、 sprinker components etc .filling in the blank of china for the air float-type lawnmower technology.

在潜心攻克技术难关六年的基础上，隆重推出了我公司的拳头产品——气垫悬浮式系列剪草机、吹风机、肥料播撒器等，填补了我国在气浮式剪草机技术上的空白。

It also deployed a squadron of FA-18s to conduct close air support and ground attack missions in southern Iraq, two C-130 transport aircraft to help with logistics, and a Special Air Service squadron for pinpoint targeting in support of air strikes within Iraq.

它还部署了一支FA-18战斗机中队，在伊拉克南部进行严密的空中支援和地面攻击战斗，安排2架C-130运输机支援后勤，一个特别空中服务中队进行精确定位，在对伊拉克进行空袭的时候提供支持。

Using RFPA2D-Flow stereo-gasses coupled system to simulate the process of gas draiange in lower air permeability coal seam by loose blasting,it interprets that loose blasting is a effective ways to increase air permeability in low air permeability coal seam .

运用RFPA2D-Flow固气耦合系统模拟了松动爆破抽放低透气性煤层内瓦斯的过程，解释了爆破松动是增加低透气性煤层透气性的有效途径，本文对松动爆破前后抽放过程中煤层内瓦斯压力和瓦斯渗流场的变化规律进行了数值模拟对比，为进一步理解瓦斯抽放、松动爆破增透机理等提供理论基础和科学依据。

Sea/air service - Combine the economies of ocean freight and the speed of air freight with customised solutions from our ocean and air freight experts.

海／空运服务-通过我们的海运和空运专家为您提供的定制解决方案，将海运的经济性和空运的速度特点结合在一起。

Comparing with the test results of exposure to pure air, the scale reading difference between exposures to polluted air and pure air is of statistical significance; i.

B。对比受试样品舱排除气与&0&空气的眼刺激感觉强度，差别有统计学意义，即要求p.05。

Promax Tension Ind Corp has long sold and manufactured a variety of custo mized air shafts/ air chucks/ safety chucks, edge position control systems/ EPC, powder/ air/ disk brakes and clutches, AC/DC motor control systems, re-winding/ un-winding systems

本公司长久以来已经从事制造及销售有关纸类，薄膜，胶片，纺织品，橡胶等薄片卷材的卷筒物控制糸统周边设备，诸如气涨轴，气涨/安全夹头，边缘追踪器装置，磁粉/气压/碟式煞车器及离合器，交直流转矩马达控制系统，收放料车动系统，张力控制装置，印刷机静态观测器，自动套色控制装置，伺服向量控制系统，人机介面及监控系统及其他有关印刷，贴合，分条，复卷，涂布，上胶，押出，淋膜等产业机械。

The daily mean air temperature of 20 cm height,daily change of air temperature and daily maximum temperature in the areas without intercropping were higher or larger than those with intercropping of rye grass;the air humidity in the areas with intercropping of rye grass was higher than that without intercropping.

结果表明，在热状况下，自然裸露区域桃园的空气温度日较差、日极端最高温度和20 cm高度处的空气平均温度均高于黑麦草套种区，空气湿度则黑麦草套种区明显大于自然裸露区。

Based on common technology of stove, the authoor used energy-saving techniques such as return air wall,air return way, Gasification chamber, secondary air, hear water box, and insulation measures, which effectively improved thermal efficiency of the large stove, and energy-saving was prominent.

作者在一般炉灶的基础上，采取了如砌上回风墙、回风道、汽化室，增设二次通风管、热水箱，加强绝热等等结构改造的节能技术，使大型炉灶热效率大幅提高，省能显著。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。