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61, Most of Minisize span suspension bridges with steel truss beam constructed in early age will approach its designed working life.

62, The density of the synthetic fiber is progressive structured by the clean air way with higher filter efficiency and longer working life.

63, Heat treatment technics such as tempering, vibration aging,(Sentencedict) induction quenching and so on adopted on key parts like bed enable more stable accuracy and longer working life.

64, Two blades can alternate use to insure the sweep effect and prolong the working life.

65, He is best know for his trilogy on working life.

66, The attrition is even to satisfy the requirement of its working life, which provides the electromagnetic brake with better security and longer working life.

67, This research dealt with the axial thrust and the wearability of graphite bearing of a vertical canned motor pump, which are the two critical problems about the pump's working life.

68, Based on the corrosion depth and pipe working life, the functional relationship between the pipe bend wear speed and conveying speed is proposed.

69, With the structure and material of burner of stove improved the burning effect of gas gets better, blasting temperature of hot blast stove raised and working life of stove prolonged.

70, This type of cooling device can decrease iron mold temperature effectively and uniformly, lengthen working life of iron mold, and also improve the working environment.

71, A kind of whole plastic clothes-pin mold is introduced, for this clothes-pin, it needs no metal spring, with low manufacture cost and long using ages, also, the mold has a long working life.

72, The flaw undersurface and stress on the step at the edge side of roller are the major factors that influence the timing chain working life.