螺旋

This kind of configuration suits the multi-nucleotide chain's purine pyrimidine alternate area. in 1989, the American scientists with scanning tunnel electron microscope law visual observation double helix DNA double helix DNA ︰ in 1952, Austrian lineage US biology chemist Zha Qiefu (E.chargaff,1905-) have determined in DNA 4 kind of basic group content, the discovery gland fat ling and thymine quantity are equal, the bird fat ling and cytosine quantity is equal.

这种构型适合多核苷酸链的嘌呤嘧啶交替区。1989年，美国科学家用扫描隧道电镜法直接观察到双螺旋DNA 双螺旋DNA︰1952年，奥地利裔美国生物化学家查伽夫（E.chargaff，1905—）测定了DNA中4种碱基的含量，发现其中腺膘呤与胸腺嘧啶的数量相等，鸟膘呤与胞嘧啶的数量相等。

The models of cutting edge, the flute of ball end milling cutters with spiral flute of different section, and the section profile and relative feed speed of grinding wheel are provided.

分析了三种不同定义的螺旋刃口曲线的异同和与优劣，给出了二轴联动数控加工时不同截形的螺旋沟槽球头铣刀的刃口、沟槽及砂轮截形、相对进给速度等设计模型，并通过实得沟槽及计算机模拟结果进行了验证，认为借助该模型可获得较理想的球头回转铣刀。

Started by massaging the back of the hand fingertips start to finger roots, action should be calm and gentle; and then spiral massage the palm, and knuckles touch points on the palm of the hand; and finally with the index finger and middle finger grip fingers, fingers from the roots to the spiral spin stretching, massage to the fingers of each root.

先从手背指尖开始按摩到手指根部，动作要从容而柔和；然后螺旋形按摩手掌，并用指关节轻按手心上的穴位；最后用食指和中指夹住手指，从根部向指尖螺旋状旋转拉伸，每一根手指都按摩到。

The experimental results indicate that, over a ranger of tube side Reynolds number and Prandtl number (Re=4000~20000, Pr=6~7.5), the internal Nusselt number and friction factor of spiral-flat tube increased by 30%-150% and 20%-50% respectively compared with smooth tube at the same Re and Pr. The value of friction factor decreases with increasing the value of B/A as well as increasing that of S/de, and the same phenomena can also be observed for Nusselt number.

实验结果表明：管内Nu和f值均随均随B/A值和S/de值的增大而减小，但随B/A值的增加而减小得更快，B/A值对螺旋扁管管内传热与流阻性能影响更大；在相同Re和Pr下，螺旋扁管管内Nu数为光滑管的1.3～2.5倍；阻力系数f是光滑管的1.2～1.5倍。

Combined characteristics of gravity and spiral tube centrifugal,a kind of spiral tube compound gas liquid separator was developed.

结合重力和螺旋管离心力分离的特点，提出一种螺旋管复合气液分离器结构。

However, when the helix angle are not equal, the gear with the larger helix angle should be used as the driver if both gears have the same hand.

但是，当螺旋角不相等，则齿轮与大螺旋角应作为司机，如果这两个齿轮具有相同的手。

The helix angle is the same on each geas, but one gear must have a right-hand helix and the other a left-hand helix.

节面角在每上相同geas，但是一个齿轮必须有一个右手螺旋和其他一个左手螺旋。

The helix angle is the same on each gear, but one gear must have a right-hand helix and the other a left-hand helix.

节面角在每个齿轮上相同，但是一个齿轮必须有一个右手螺旋和其他一个左手螺旋。

This processing is located in Zhangzhou City in Fujian Province, China, close to Xiamen, production and sale of various types of gear, operating standards are gears, changing gear, helical gears, straight bevel gears, bronze worm gear, herringbone gear, sprocket, gear row, spiral clutch, milling plane, internal and external spline, keyway milling and hobbing machine and other processing, lathe processing and high-frequency heat treatment.

本加工场位于中国福建省漳州市境内，紧邻厦门，经营蜗轮加工与蜗轮减速机维修，生产和销售各式齿轮，经营标准正齿轮，变位齿轮，螺旋齿轮，直齿圆锥齿轮，铸铜蜗轮，人字齿轮，链轮，齿排，螺旋离合器，铣平面，内外花键，键槽等铣床和滚齿机加工，车床加工和高频热处理。

This processing is located in Zhangzhou City in Fujian Province, China, close to Xiamen, production and sale of various types of gear, operating standards are gears, changing gear, helical gears, straight bevel gears, bronze worm gear, herringbone gear, sprocket, gear row, spiral clutch, milling plane, internal and external spline, keyway milling and hobbing machine and other processing, lathe processing and high-frequency heat treatment.

本加工场位于中国福建省漳州市境内，紧邻厦门，生产和销售各式齿轮，经营标准正齿轮，变位齿轮，螺旋齿轮，直齿圆锥齿轮，铸铜蜗轮，人字齿轮，链轮，齿排，螺旋离合器，铣平面，内外花键，键槽等铣床和滚齿机加工，车床加工和高频热处理。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。