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单选题
546.Arrows shall be used to indicate flow direction when needed to
546.Arrows shall be used to indicate flow direction when needed to
understand the schematic diagram.
A
When you need to understand a schematic diagram,use arrows to indicateflow orienting.
B
Arrows shall be used to indicate flow ends when needed to understandthe schematic diagram.
C
When need to comprehend the chart,you should use arrows point to thedirection.
答案解析
正确答案：A
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