Adhere to the safety instructions.

A. Record the results if the frequency changes.

B. Alter the phase and record the results.

C. Change the frequency and record the results.

A. 一切排故和测试活动都要用中央维护计算机。

B. 中央维护计算机的一切排故和测试项目都被应用。

C. 中央维护计算机被用来进行所有的排故和测试活动。

A. 重心是飞机悬浮时保持平衡的点。它与参考基准的距离是通过总力矩除以飞机的总重量得出的。

B. 飞机的重心是使飞机保持平衡的点。它与参考基准的距离可以通过总弯矩除以飞机总重量找到。

C. 重心是如果飞机悬着使飞机保持平衡的点。它到参照基准的距离可以通过总长度除以总重量找到。

A. 英语单词、复杂的句子结构以及多个含义和缩写词会对读者造成混淆。

B. 复杂的句子结构、多个含义和术语以及多个英语单词会对读者造成混淆。

C. 复杂的句子结构以及英语单词的多重含义和同义词会对读者造成混淆。

A. 确保舱门与其附近表面平齐。

B. 确保使用与舱门表面相似的材料对舱门进行打磨。

C. 确保舱门材料与其附近表面材料相同。

A. The air conditioning system keeps the air in the pressurized fuselage compartments at the correct pressure, temperature and freshness.

B. The air conditioning system keeps the air in the pressurizing cabin of the fuselage at the correct pressure, temperature and freshness.

C. The air conditioning system keeps the air in the pressurized cabin of the fuselage at the correct pressurization, temperature and freshness.

A. The applicant for an avoidance permit must show that the approval of the avoidance permit will not affect safety and must provide an explanation. The applicant shall take measures to ensure that the level of safety is equal to the level of safety provided

B. The petitioner for an exemption must include reasons why safety would not be adversely affected if the exemption is granted, or must explain the action to be taken by the petitioner to provide a level of safety equal to that provided by the rule from whic

C. The applicant for an exemption permit must state the reasons why safety will not be affected by the granted approval, or must take measures to ensure that the level of safety provided is consistent with the requirements of the regulations seeking exemptio

A. 可以通过拆下保护盖来接近机械装置。

B. 重新安装保护盖来接近机械装置。

C. 拆下保护盖来获得机器。

A. Give precise instructions for using emergency exits.

B. Give special directions for using urgent exits.

C. Give accurate data for using urgent exits.

A. 调节的精度可以改变。

B. 调整后的精度可能会改变。

C. 调节的程序可以改变。