Methods for determination of water vapour transmission rate of sheet materials paper and board by dynamic sweep and static gas methods 用动态吹气和静态气体法对纸和纸板的水蒸汽透湿率的测定方法
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The moisture permeability standard of the field operation ammunition envelop material was reasoned through calculation of the relative humidity in the interior of the envelop 摘要通过计算封套内部的相对湿度,论证了野战弹药封套材料的透湿率指标。