阐述了国内外螺旋类零件的螺纹在车床上加工时存在的问题，并介绍了正确的判断方法及加工方法。
The problems that exist during machining screw with lathe both abroad and at home are presented, the method for judging and machining screw are introduced.
星系主要分为三类：螺旋星系、椭圆星系和不规则星系。
Galaxies are classified into three main types: spiral galaxies, elliptical galaxies, and irregular galaxies.
方形螺旋天线结构简单、频带范围宽，是一类性能优良的天线，但在变成定向辐射后其带宽会大大减小。
The square spiral antennas have many outstanding merits such that its structure is simple and its bandwidth is wide.
船用螺旋桨是一类典型的自由曲面零件，它的设计和制造精度直接决定了其推进效率。
Marine propeller is a type of free form surface part. Its design and manufacture precision decide ship's thrust efficiency directly.
研究结果表明，挡墙背后土体存在着沿平面滑动和绕对数螺旋柱面转动两类临界状态，对应有两种不同类型的水-土压力分算方法。
Under the precondition of computing water and earth pressures separately, the effect of the computation method of earth pressure on that of water and earth pressures is studied.
结果共采集蜱1 779只，送检232份，共检出3类病原微生物，即巴尔通体、立克次体和伯氏疏螺旋体；
Results A total of 1 779 ticks were collected, 232 ticks were tested, and 3 microorganisms were found:Bartonella, Rickettsia, Borrelia burgdorferi.
为了提高在以溴化锂为工质的第二类吸收式热泵吸收器的性能，在第二类吸收式热泵吸收器内对不锈钢螺旋槽管，即不锈钢光滑管的传热传质性能进行了实验研究。
To improve the performance of heat transformer, a spirally corrugated tube in the absorber was used. And research for its heat and mass transfer performance was conducted experimentally.
我们将这一类天线称为非频变天线。平面等角螺旋天线是这一类天线的典型例子。
This kind of antenna is called non frequency transforming antenna, a typical instance is plane isogonal corkscrew antenna.
通过对螺旋锥齿轮机械式铣齿机与CNC铣齿机之间加工调整参数转换原理的研究，推导了这两类机床运动轴数学模型；提出了求解各运动轴表达式系数的速度求导法。
By studying the transformation principle of the machining setting parameters from cradle style machine to CNC gear generator, mathematical kinematic models of every axis are deduced.
EF手图像超家族蛋白泛指一类含有由螺旋区-泡区-螺旋区构成的EF手图像模体的蛋白。
The EF-hand superfamily is a large group of proteins which contain EF-hand motif formed by helix-loop-helix.
动力、能源类 ：电源、发动机、电机、电池、螺旋桨、减速箱、电子燃油控制等；
Power and energy : power, engine, motor, battery, propeller, reducer, electronic fuel control, etc. ;
数字显示，垂直bodycut一类的“G ”螺旋桨whith曲柄类型的运动学。
Thee figure shows a vertical bodycut of a type "G" propeller whithcrank type kinematics.
数字显示，垂直bodycut一类的“G ”螺旋桨whith曲柄类型的运动学。
Thee figure shows a vertical bodycut of a type "G" propeller whithcrank type kinematics.
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