使用得当的防晒系数为8或更高的防晒霜在完全阻挡紫外线辐射的同时也阻止了维生素d的合成。
Used properly, sunscreens with an SPF of 8 or higher completely block UVB radiation and prevent synthesis of vitamin d.
对各工况下的二维疲劳载荷，采用权系数的方法，合成并获得了多工况下的二维载荷联合概率密度函数。
Two dimensional fatigue loading under various working conditions is synthesized with weight coefficient method to obtain joint probability density function under multiple working conditions.
研制出由多组份粘合剂、混杂纤维及特殊填料制成的无石棉高摩擦系数合成闸片。
There were developed asbestos free high friction coefficient composition brake pads made of poly compound adhesive agent, hybrid fiber and special fillings.
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