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.
A.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 B.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 C.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正确答案C