单选题

If a supply shutoff valve was closed for less than five minutes ho maintenance is required and shutoff periods are hot accumulative.

A If a supply shutoff Valve was closed within five minutes of maintenance performance is needed and shutoff periods are hot 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.

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正确答案：A （备注：此答案有误）

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