A sleep function allows the drives to be cycled off when the system demand drops below a preset level, and restarted automatically when the demand increases.

睡眠功能允许驱动在系统需求降到一个预设级别之下的时候就停止运行，而当需求增加的时候又自动重新启动。

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The jacked pile, as one of the types of pile foundation engineering, overcomes the resistance of soil and sinks to the preset level by less static pressure while affording a larger bearing capacity.

压入式沉桩是以较小的静压力，使桩克服土体的阻力，把预制钢筋混凝土桩沉入预定的标高，从而获得较大的承载力的桩基工程。

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At the preset temperature level the bimetal element is switching.

在预设的温度水平，双金属元件进行切换。

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Typically that's 35% above a certain preset level.

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