The difference of the meanoperatingtime and blood loss between tow groups were not significant(P 0.05).
两组手术时间、术中出血量差异无显著性意义(P〉0.05)。
2
If the 50% actual operatingtime of aircraft engine is greater than the mean TBO in airline operation, the TBO can be prolonged. The method for estimating the prolonged life is also given.