高速大长径比压力反应釜搅拌轴密封性能问题一直是设计者与使用者研究的难题。
The sealing property problem for the stirring shaft of high-speed pressured reaction axe with large length to diameter ratio is always a difficult problem to study for designers and users.
上个月，发表在《中枢神经系统频谱》上的一项研究声称是第一个大规模的对网瘾使用者的研究。
Last month, a study published in CNS Spectrums claimed to be the first large-scale look at excessive Internet use.
多数研究侧重于移动电话使用者接触射频的情况。
Most studies have focused on the RF exposures of mobile phone users.
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