Automatically modulating the fan's rotational speed according to cooling requirement can not only reduce the power and fuel consumptions, but also reduce noise level and prolong the engine's lifetime.
根据冷却的实际需要自动调节风扇的转速，不仅可降低功率消耗、节省燃油，而且还可以达到降低噪声、延长发动机寿命等效果。
The difference method for solving pure vibrational energy level and vibration-rotational energy level is proposed in this paper.
提出了利用差分法计算双原子分子纯振动能级和振-转能级的具体方法。
The result of three years from 1997 to 1999 showed significant effect of post grazing residual and P level on seasonal and annual net production of the sown pasture under sheep rotational grazing.
三年试验结果表明，绵羊在轮牧下，产草量和磷肥对全年及各月牧草净生产具有显著影响。
The result of three years from 1997 to 1999 showed significant effect of post grazing residual and P level on seasonal and annual net production of the sown pasture under sheep rotational grazing.
三年试验结果表明，绵羊在轮牧下，产草量和磷肥对全年及各月牧草净生产具有显著影响。
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