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单选题
1055. A male and a female flange prevents the IPCV from incorrect installation A flow direction arrow on the valve also helps prevent incorrect installation
A
Only the flow direction arrow on the valve can prevent incorrect installation.
B
A male and female flange are used to prevent the IPCV from incorrect Installation. The flow direction arrow on the valve can not do the same function expect for showing the flow direction.
C
Either the male and female flange or the flow direction arrow can prevent incorrect installation.
答案解析
正确答案：C
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