S type thermocouple with short length
focal length
透镜焦距
物焦距
天线焦距
焦点距离
焦距
焦
凹面反射镜
焦深
焦长
focal length calibration
focal length of objective glass
High carbon and high molybdenum high speed steel
High Carbon High Vanadium High Speed Steel
high vanadium and high cobalt high speed steel
short driving and short lining
anchorage length and lap length
ratio of pulse length to the total cycle length
span length of length bar
abnormal high temperatures and high pressures packet