The noise suppressor reduces the noise generated by the exhaust gases.

A. The autopilot has reached its roll authority limit due to an airplane roll or yaw asymmetry.

B. The autopilot has been out of its roll authority limit due to an airplane roll or yaw symmetry.

C. The autopilot has reached its yaw authority limit due to an airplane roll or yaw imbalance.

A. 4个轴承支撑N2轴的后部。

B. 第4号轴承支撑N2轴的后部。

C. 第4号轴承支持N2轴的前部。

A. 对于这个地区以外的人来说，这些词很难理解。

B. 对于这个工作专业以外的人来说，这些词很难理解。

C. 对于这个空域以外的人来说，这些词很难听清楚。

A. If you do not obey these precautions, injury to your skin and lungs can occur.

B. It will cause damage to your skin and liver unless you follow the cautions.

C. If you understand the instructions, you body will not be hurt.

A. 工作区域一定会有好的空气流通。

B. 工作区域内必须有好的空气流通。

C. 一定会有好的空气流通工作区域。

A. It＇s not easy to install more than two washers for each bolt.

B. It is forbidden to install more than two washers for each bolt.

C. Installing one washer for each bolt is forbidden.

A. 对于活塞式发动机，向发动机输送计量燃油和空气的装置和部件。燃油部分包括化油器、从进气侧到排气喷口的主控、喷油泵、化油器、喷油嘴和启动喷油装置。

B. 对于往复式发动机，向发动机输送燃料和燃气的装置和部件。燃料部分包括从出气侧到排气喷嘴、喷油泵、化油器、喷油嘴和燃油底火的化油器控制。

C. 对于往复式发动机，向发动机输送燃料和空气的装置和部件。燃料部分不包括从进气侧到排气喷嘴、喷油泵、化油器、喷油嘴和燃油底火的化油器控制。

A. 本程序给出了用于水管临时修理的两种方法。

B. 本程序给出了水管的永久修理方法。

C. 本程序详细阐述了两种方法来解决水管的修理。

A. The primary cause of valve failure is contamination of the hydraulic fluid.

B. The primary cause of valve failure is poisonousness of the hydraulic fluid.

C. The primary element of valve failure is contamination of the hydraulic fluid.

A. Due to the incorrect level of pressure, the system will not work.

B. As long as the fluid level remains unstable, the system will fail.

C. Because the fluid level is incorrect, the system will not operate.