单选题

This is a recommended precaution to keep the center tank in good condition. It is recommended that you do this procedure at intervals of 100 days.

AA. 此条为视情釆取的预防措施，以使中央油箱保持良好状态。每间隔100天视情执行一次此程序。

BB. 此条为必须釆取的预防措施，以使中央油箱保持良好状态。每间隔100天视情执行一次此程序。

CC. 此条为建议来取的预防措施，以使中央油箱保持良好状态。建议间隔100天视情执行一次此程序。

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正确答案：A （备注：此答案有误）

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