The researchers say the strengths of their study are that it included a large cross-section of the control population, and the diagnosis of asthma was on standard guidelines.
研究人员所他们研究的强度是该研究包含了一个大型的对照组人群横截面，同时哮喘诊断采用了标准的诊断指南。
Control valve is a pipe attachment, which is used to change the channel cross-section and flow direction, the control flow of a medium transport device.
调节阀是一种管路附件，它是用来改变通路断面和介质流动方向，控制输送介质流动的一种装置。
The technology can be used to keep cross-section excavation in control and improve explosion level.
该技术在控制断面超欠挖，提高光面爆破水平效果明显。
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