By monitoring the level and vertical degree, and controlling the tube not to slope and rotate, it guarantees the quality of the concrete out of formwork in terms of the maintenance.

加强水平和垂直度监控，控制筒身倾斜及扭转；加强出模混凝土的收光和养护，保证出模混凝土的质量。

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The construction method for the biological brick on a rock slope comprises slope trimming, biological hexagonal brick pavement, anchor bolt driving, net suspension, covering and maintenance.

其在岩面边 坡上施工方法包括边坡修整、铺设生物六棱砖、打锚杆、挂网、覆盖 和养护。

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North Slope producers are occasionally advised by Alyeska to prorate production, or reduce output proportionally, for example, when maintenance work is performed on the pipeline.

WSJ: BP to Cut Oil Production on Alaska's North Slope