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单选题
425.If a supply shutoff valve was closed for less than five minutes ho maintenance is required and shutoff periods are not accumulative ( )
A
If a supply shutoff valve was closed within five minutes of maintenance performance is needed and shutoff periods are not accumulated.
B
Maintenance action is not necessary and shutoff periods are not calculated unless the shutoff valve was closed for less than five minutes.
C
When a supply shutoff valve was closed for five minutes, maintenance action is hardly required, and shutoff duration are not included.答案解析
正确答案：A
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