To make clear operation rules & character ist ic of different category fans series, this study select "Exhaust characteristic o."

为了弄清异类风机串联时的性能特点和运行规律， 本课题选择“横流风机与离心风机串联排气特性”为研究的对象。

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This thesis will select this topic to study, because this topic has practical significance to the reality.

本文选择对这一课题进行研究，有着重要的现实意义。

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Therefore, there is not only the theoretical significance but also the practical significance to select this subject: Study on the Questions of Rural Land Transference.

因而本文选择我国农村土地流转问题研究这一研究主题，不仅具有理论意义，而且还有特别的实践意义。

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This study is important because it included a large number of participants and was among a select few studies to evaluate total time spent sitting.

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However, to achieve this goal the NCS planners made a decision to randomly select neighborhoods within each county and to have study personnel go door-to-door to recruit women who were pregnant or planning to become pregnant, much as census workers do to reach under-represented groups.

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