A hole of several inches in diameter may be cut in a piece of metal at a point where the metal is not needed for strength, and the edges of the hole are flanged to give it rigidity.

A. 语音通信利用语音调制电磁波来从空对空或空对地的设备传输和/或接收消息。

B. 语音通信利用调频的电磁波来从空对空或空对地的设备传输和/或接收消息。

C. 语音通信利用调幅的电磁波来从空对空或空对地的设备传输和/或接收消息。

A. The recommended inspection procedure provided by the manufacturer when delivering the aircraft helps to ensure its airworthiness throughout its life. Due to differences in the tasks performed, maintenance provided, service life, and usage rate of the aircraft, ABC Company has determined through inspection, testing, and analysis that it is necessary to provide additional inspection requirements to further ensure that the aircraft can continue to operate under the initial approved design load.

B. The recommended inspection procedures provided by the manufacturer at the time of delivery of the aircraft help ensure its airworthiness. Due to differences in the missions performed, maintenance given and the age and utilization of the aircraft, ABC has determined, based on inspections, testing and analysis, that additional inspection requirements are deemed necessary to further ensure that the aircraft can continue to operate at the initially validated design loads.

C. The airplanes were delivered with recommended inspection programs to keep them airworthy. Because of the varied missions the airplanes performed, type of care given, and age and utilization rates, ABC has determined, based on inspections, tests, and analyses, that it is necessary to provide additional inspection requirements to further ensure that the airplanes can continue to carry the design loads it was originally certified for.

A. Outside Air Temperature is the free air static temperature, obtained either from inflight temperature indications or ground meteorological sources, adjusted for instrument error and compressibility effects.

B. Outdoor Air Temperature is the dynamic temperature of free air, obtained from flight temperature indications or ground meteorological sources and adjusted for instrumental error and compressibility effects.

C. Outdoor Air Temperature is free air stagnation temperature, from flight temperature indicating or ground meteorological resource, and according to the instrument error and compressibility effects to adjust.

A. 如果读者必须了解某个额外要求才能执行工作程序和步骤，先给出这个要求。

B. 如果读者在执行某个工序或工作步骤之前必须了解某个具体情况，则首先说明这个具体情况。

C. 读者在执行程序或工作步骤之前是否必须知道哪些特定条件，需要先明示。

A. 将五份缺陷报告送到工程主管部门。

B. 将五份无损报告送到发动机权威人士。

C. 将五份探测报表送到主管工程师。

A. 如果可行的话，手册中出现的计量单位应该保持一致。

B. 实际上，手册中出现的测量值必须保持一致。

C. 手册使用的计量单位必须与实际情况保持一致。

A. Recommending or requiring life limited components is on the right side of the page in an appropriate margin.

B. Recommended or required retirement time of life limited parts is on the right side of the page in an appropriate space.

C. The required retirement time of life limited components is located on the right side of an appropriate space.

A. For line maintenance carried out at a line station of an organization which is located outside the Community territory, the certifying staff may be qualified in accordance with the national aviation regulations of the State in which the line station is ba

B. For line maintenance organization located outside the Community territory, the certified staff may be qualified in accordance with the national aviation regulations of the State in which the line station is based.

C. For maintenance organization whose line station is located outside the Community territory, the releasing staff may be audited in accordance with the aviation regulations of the its State.

A. 这将使用户可以通过检查一份清单来识别受影响的飞机，而不必检查每个单独的持续适航计划以确定适用性。

B. 这将允许用户通过检查一份清单来找出受影响的飞机，或者也可以检查每一个持续适航计划的适用性。

C. 这将使用户可以通过检查一份清单来判断被影响飞机的有效性，而无需检查每个独特的持续适航计划。

A. Replace the defective booster pump.

B. Remain the present booster pump.

C. Recharge the failed booster pump.