这是因为很难对基台发射的很低信号与环境中其它较高强度的射频信号分别造成的可能健康影响进行区分。
This is because of the difficulty in distinguishing possible health effects from the very low signals emitted by base stations from other higher strength RF signals in the environment.
一些小的钢铁公司则会专注于一些利基市场，如瑞典的瑞典钢铁集团专著于生产高强度钢板，具有很高的利润率。
Some small producers with a focus on a niche in the market, such as Sweden's SSAB, a company specialising in high-strength steel, are very profitable.
在纤维素基制品中，为提供强度和起皱而向原材料加入的添加剂。
Additives for addition to starting materials in cellulose based products for imparting strength and crepe.
应用推荐