求翻译：在M工序之前有两条路径，即K-M和K-L-M，由于两条路径都可以完成M工作，所以选工期短的那条路径为关键路径，K-M路径的工期为20天，K-L-M路径的工期为30天，所以K-M路径为关键路径。是什么意思？

There are two paths before the m processes km and klm, two paths can be completed m the work, so choose a short duration that path, critical path, km path duration of 20 days the, klm path duration for 30 days, so km path is the critical path.

Before operations in M there are two paths, i.e. K - M and K - L - M, because the two paths are M work can be done, so check the short construction period that path to critical path, the path M K - duration is 20 days, K - L - M path for the period was 30 days, so K - M path to critical path.

In front of M working procedure has two ways, namely K-M and K-L-M, because two ways both may complete the M work, therefore chooses the time limit for a project short that way is the essential way, the K-M way time limit for a project is 20 days, the K-L-M way time limit for a project is 30 days, t

M process, there are two paths, namely K-M and K-L-M, because the two paths can be completed m, so the path of the selected duration shorter for key path, K-M path the duration to 20 days, duration of 30 days of K-L-M path, so K-M the path to the critical path.

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