There was a significant difference between cord arid serum bilirubin (P<0.001).

脐血胆红素与血清胆红素间差异非常显著（P<0.001）。

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P. to present, a warm semi-humid and semi-arid stage.

至现在温暖半湿润、半干旱阶段。

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The random stress of torsion rod spring may be calculated after road surface, vehicle speed arid constructional parameters are given, and service life may be estimated according to P-S-N curve.

在给走路面、车速、结构参数后，可计算出扭杆的随机应力，并根据P - S - N曲线估计出扭杆的寿命。

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