Switch from a grow-in to a maintenance fertilizer regime at 4 to 6 weeks after emergence, or when the grass has reached nearly 100% ground coverage.

一般在发芽后4 - 6周，或者当草坪100%完成地面覆盖后从生长期用肥转换到养护用肥。

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This article analyzes the causes of repeated emergence of engine bearing insert burned-out and provides practical solutions, according many years practical experience on engine maintenance and repair.

结合多年修理发动机的实践，对重复发生发动机烧瓦事故的原因进行了分析，并提出了具体解决方法。

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Topology maintenance methods are proposed to manage the emergence of nodes leaving and joining.

针对节点离开和新节点加入两种网络结构变动的情况提出了网络结构维护措施。

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