59.请注意, 飞机的改装或修理工作必须由持照人员完成。

　 Please designate licensed personnel to do modification or maintenance to airplane.

　 Alterations or repairs to airplane shall be accomplished and noted by licensed personnel.

　 Please note that alterations or repairs toairp1ane must be accomplished by licensed personnel.

正确答案：C

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2、The airplanes were delivered with recommended inspection programs to keep them airworthy.

1、The properties of these sealants prevent corrosion.

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