1 In most cases, periodic evaluation of test and control materials is necessary to determine the variation in magnitude and direction of property changes as a function of exposure time or radiant exposure.
1 In most cases, periodic evaluation of test and control materials is necessary to determine the variation in magnitude and direction of property changes as a function of exposure time or radiant exposure.
在大多数情况下,有必要定期评价试验材料和控制材料,以测定(涂料)属性改变在大小和方向上的变化.该变化是暴露时间或辐射曝露量的函数.