Note: Some code listings may have a backslash character, "\", to indicate the line of code is continuous but has been formatted for readability.

注意：有些代码清单有反斜杠字符“\”，这表示代码行是连续的，但为了可读性，这里对其格式作了调整。

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A heavy continuous line may highlight the main process lines and the direction of the flow should be shown. all plant items should be labeled and named.

主工艺线条要使用粗实线加以突出，流动方向要标示。工厂的所有设施都应该标记并命名。

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