螺

• Active control of propeller induced aircraft cabin noise
  螺桨飞机舱内噪声的主动控制
• Hexagon bolts with split pin hole on shank - product grade a and b
  六角头螺杆带孔螺栓
• Specification for turnbuckles tension rod type for aircraft purposes
  航空用松紧螺套
• Oil injected single screw air compressor for general use
  一般用喷油单螺杆空气压缩机
• Verification regulation of horizotal spiral blade water meter
  水平螺翼式水表检定规程
• Inserts , thin wall , self - locking . design standard
  自锁紧薄壁螺套.设计标准
• Industrial pipework . reduced shank bolts . specifications
  工业管道.小螺杆的螺栓.规范