Procedures shall be provided for making emergency descent.

A. Examine the seal for defects.

B. Check the abnormality of the sealant.

C. Inspect whether there are the defaults in the solvent.

A. 1944年，随着空中航行法令和规章的各种要求得以实现，英国民用适航机构形成了适航标准的法典。

B. 1944年，英国制定了民用适航要求来形成空中航行指令和规则守则。

C. 1944年，随着英国民用适航要求的制定，形成了适航标准的法典，通过该法典，空中航行法令和规章的各种要求得以实现。

A. The aircraft navigation systems provide the flight which is required by the crew,and meet the the most appropriate safety requirements.

B. The aircraft navigation systems provide the crew with the data required for flight within the most provisional safety requirements.

C. The aircraft navigation systems provide the crew with the data required for flight within the most appropriate safety requirements.

A. Visually check the forward engine mount to the fan frame bolts if they are correctly installed and damaged.

B. Do a visual check of the bolts which attach the forward engine mount to the fan frame for the correct installation and damage.

C. Visually check the correct installation and damage of the forward engine mount to the fan frame bolts.

A. 做步骤1到4以确保没有剪切载荷施加到端头上。

B. 做步骤1到4以确保没有径向载荷施加到轴上。

C. 做步骤1到4以确保没有轴向载荷施加到杆上。

A. In an emergency, the one-shot battery supplies DC power.

B. The one-act battery supplies AC power during emergencies.

C. The one-side battery provides DC power during emergency situations.

A. Apply two kindreds of protective compound to shield the sealant from any harm caused by hydraulic fluid.

B. In order to prevent damage to the sealant from hydraulic fluid, it is necessary to apply two layers of protective compound.

C. To prevent hydraulic fluid from drowning the sealant, it is recommended to apply two layers of protective compound.

A. Extend the nose landing gear.

B. Extend the main landing gear.

C. Retract the main landing gear.

A. 这些密封剂的特性可预防腐蚀。

B. 这些封严块的性能可阻止碰撞。

C. 这些溶液的性质可防锈。

A. 把上凸轮放到与拆下时所做标记一致的位置。

B. 上部卡箍安装的位置应该与拆卸标记保持一致。

C. 经同意后，对应拆卸时所作的标记将上部曲柄安装在位。