单选题

Arrows shall be used to indicate flow direction when needed to understand the schematic diagram.

AWhen you need to understand a schematic diagram, use arrows to indicate flow orienting.

BArrows shall be used to indicate flow ends when needed to understand the schematic diagram.

CWhen need to comprehend the chart, you should use arrows point to the direction.

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正确答案：A （备注：此答案有误）

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