高低

If the lips are made flat the tone will be harsh. The difference between the two different tones is not pitch but a difference of quality or tone color.

但是，若闭着双唇而发出的声音便不悦耳；其中的差别，不在于声音的高低，而是因为它们的音质或音色在根本上不同的缘故。

Exchange power supply system including electrical network height power source, kerosene engine power set emergency power supply (long time emergency power supply), integral part's UPS power source; The cocurrent power supply system by the rectifier, the accumulator cell (short time emergency power supply), the direct-current converter as well as the corresponding power distribution cabinet is composed; The good earth and the antimine device, may improve the correspondence quality, guarantees the communication facility and operator's security.

交流供电系统包括电网高低电源、油机发电机组备用电源、重要部门的UPS电源；直流供电系统则由整流器、蓄电池、直流变换器以及相应的配电柜组成；良好的接地和防雷装置，可以提高通信质量，确保通信设备及操作人员的安全。

Methods cDNA retro-transcribed from equal quantities of mRNA derived from high and low metastatic tumor cells or normal ovarian tissues were labeled with Cy5 and Cy3 fluorescein as probes. The mixed probe was hybridized with two pieces of BioDoor 4096 double dot human whole gene chip and scanned with a ScanArray 3000 laser scanner. The acquired image was analyzed by ImaGene 3.0 software.

按一步法分别抽提高低转移人卵巢癌细胞和对照正常卵巢组织的总RNA并纯化mRNA ；分别将等量的高低转移人卵巢癌细胞及对照组织的mRNA逆转录合成以Cy5和Cy3标记的cDNA一链做探针，分别混合后在 2张含有 4 0 96条双点人类全长基因的芯片上进行杂交。

First, the theory of fretting wear and studies on fretting fatigue were introduced and the parametric method was used in the process of creating the model of dovetail joints in UG software. The elastic contact problem is analyzed in finite element method and is used to the parameters' distribution and contact stress of the joint are obtained on the base of ANSYS code. With the effect factor of load frequency, the prediction method of fretting fatigue life of dovetail joint under low and high/low cycle complex load is proposed. The proposed model and the approach were verified by experiments.

本文介绍了微动损伤的机理和微动疲劳寿命的研究方法；利用UG软件对燕尾榫联接结构创建了参数化实体模型；基于ANSYS软件平台求解弹性接触问题，获得了榫联接结构接触应力及接触状态量的分布；在已有微动疲劳寿命预测模型的基础上，引入载荷频率影响因子，对低周、高低周复合载荷作用下的燕尾榫联接结构进行了微动疲劳寿命的预测，与试验结果对比表明采用本文提出的方法预测榫联接结构的微动疲劳寿命是有效的。

Service Project: Canton dredge, pipe dredge Canton, Canton toilet repair the company's main: 10 #, 20 #, 35 #, 45 #, 27simn petroleum, chemical, textile, hydraulic, medical, electric, military machinery, coal stent , boilers, instrumentation, decorative, building and other industries with large and small caliber, and special materials, special specifications, special purpose, thin-thick-walled seamless pipe and all kinds of alloy pipes, high and low and medium pressure boiler tubes, seamless steel pipe, stainless steel pipe, fertilizer exclusive possession ; and purchasing for users to sell, joint sales, transfers the backlog of all kinds of seamless steel tubes.

服务项目：广州疏通，广州管道疏通，广州马桶维修本公司主营：10#、20#、35#、45#、27simn石油、化工、纺织、液压、医疗、电热、军工机械、煤矿支架、锅炉仪表、装饰、建筑等行业用大小口径，及特殊材质、特殊规格、特殊用途、薄厚壁无缝管及各种合金管、高低中压锅炉管、无缝钢管、不锈钢管、化肥专用管；并可为用户代购代销、联合销售、调剂积压的各种无缝钢管。

The impeller is the key component of a dredge pump. The quality of designing the impeller will directly affect the performance of slurry pump, the efficiency of dredging and the service life of impeller.

叶轮则是疏浚泥泵最关键的零件，其设计质量好坏直接关系到泥泵工作性能的优劣、疏浚效率的高低和使用寿命的长短。

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本公司主要产品有：盐雾腐蚀试验箱/二氧化硫试验箱/高温试验箱/低温试验箱/高低温试验箱/高低温湿热试验箱/高低温交变湿热试验箱/台式恒温恒湿试验箱/恒温恒湿试验箱/精密干燥试验箱/真空干燥箱/高低温冲击试验箱/紫外光加速老化试验机/氙灯耐气候试验箱/换气式老化试验箱/臭氧老化试验箱/防锈油脂湿热试验箱/砂尘试验箱/箱式淋雨试验箱/摆管淋雨试验装置/滴水试验装置/霉菌试验箱/盐雾试验室/大型高低温步入试验室/恒温恒湿试验室/盐雾恒温恒湿高温复合试验箱/温度老化室/真空紫外老化试验箱/机械式跌落试验台/振动试验台/温湿度振动三综合试验机/温度快速变化试验箱

The clearly trees and houses all looks spirt.Birds and butterfly drop and fly above hight and low stight to the horizon.

刚刚被洗净的树木和房屋显得格外精神，鸟蝶们在上面点逐着，这样高高低低地一直沿向天边。

Should consider the level of exhaust pressure and engine size.

应考虑排气压力的高低和排气量大小。

They saw few or no churches, but the prophet's mansion, the court-house, and the arsenal, blue-brick houses with verandas and porches, surrounded by gardens bordered with acacias, palms, and locusts.

这座城市建筑在约旦河岸和开始高低起伏的瓦萨奇山峦之间。这里教堂极少，有名的建筑物只有摩门先知祠、法院和兵工厂。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！