We report the growth of helical carbon nanotubes by chemical vapor deposition of acetylene(C 2H 2)at 700°C.
本文通过对有氢气预处理和没有氢气预处理两种情况下催化裂解法制备的碳纳米管的形貌、管径大小等性质的研究 ,来初步揭示螺旋状碳纳米管的生长机理 。
Application of a new helix screw thread pipe heat exchanger
一种新型螺旋螺纹管式换热器的应用
Tubing thread is available for API tubing threads and TM threads.
油管螺纹可采用API油管螺纹，或TM螺纹。
coupling straigth-way cock
两端带阴螺纹管接的直通旋塞
Three dimensional FE simulation of ball spinning of inner grooved copper tubes
内螺纹铜管滚珠旋压三维有限元模拟
Inside Weld Crack Analysis and Control of SSAW Pipe
螺旋埋弧焊管内焊缝裂纹分析与控制
FE simulation on the ball spinning forming of inner grooved copper pipe
内螺纹铜管滚珠旋压成形有限元模拟
fixed screw propeller shrouding
定螺距螺旋桨导流管
Secondly there is error between thethread roll angles of thread rolling die and drill rod.
滚丝轮螺纹和钻杆螺纹的螺旋角有误差。
NPT tapered tube thread gauges
NPT锥管螺纹量规
spiral contrapper knitting machine
螺旋形花纹吊线织袜机
Apply pipe dope sparingly on pipe threads, never on valve threads.
在管道螺纹上涂敷螺纹油，但是不要在阀门螺纹上涂螺纹油。
The spirally threaded shaft of a worm gear.
螺纹蜗轮的刻有螺旋线的柄
the raised helical rib going around a screw.
绕着螺丝的凸起的螺旋状的肋纹。
Double Spiral Fluting Tap, a New Type Threading Tool
一种新型的螺纹工具——双螺旋槽丝锥
Approximate Graphics of 3D Spiral Spring and Thread in AutoCAD;
AutoCAD中三维螺旋弹簧、螺纹的近似画法
General purpose screw threads for joints on pipe line--Dimensions
GB/T1414-1978管路旋入端用普通螺纹尺寸系列
Investigation and Development of Enhanced Tubular Heat Exchangers With C-276 Alloy
C-276合金螺旋波纹管高效换热器的研发
