Utilizing an airplane as intended by the manufacturer, combined with sound inspection and maintenance practices , forms the basis for assuring the airplane remains airworthy and safe to operate.

A. 丁酮是重度除油剂，适合金属准备和编织盖板喷漆前去油。

B. 丙酮是重度油污去除剂，适合金属表面预处理和织物蒙皮喷漆前去油。

C. 异丙醇是重度油污去除剂，适合金属生产处理和织物表面喷漆前除油。

A. If fault message continues, push the audio cancel pushbutton on the aviation electric test panel.

B. If fault message persists, press audio cancel pushbutton on the avionics test panel.

C. If fault message goes on, press audio cancel pushbutton on the airborne test panel.

A. "Maintenance Practices" include servicing, removal/installation, adjustment/test, inspection/check, cleaning/painting, and approved repairs. "Maintenance Practices" should obey the instructions of the Troubleshooting Section.

B. "Maintenance Practices" include servicing, removal/installation, adjustment/test, inspection/check, cleaning/painting, and approved repairs. "Maintenance Practices" should be located after the Troubleshooting Section.

C. "Maintenance Practices" include servicing, removal/installation, adjustment/test, inspection/check, cleaning/painting. And approved repairs should be located after the Troubleshooting Section.

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. 如果不能安全执行此地面移动操作，警告不要再次尝试它。

B. 如果不能安全执行此操作，应提供警告不要再次尝试此操作。

C. 如果不能安全执行此操作，应提供警告不要尝试此操作。

A. During ground speed braking, all the spoiler panels are activated.

B. During ground deceleration, all the spoiler panels are closed.

C. During ground speed stabilizes, most of the pedals are activated.

A. Operational Tags need to be listed or made a legend.

B. Operating Placards shall be listed or illustrated.

C. Operation Instructions have to be listed or mapped out.

A. When hydraulic system B engine drive pump pressure is under normal conditions，the hydraulic power transfer unit system supplies standby hydraulic pressure to the leading edge flaps and slats.

B. The hydraulic power transfer unit system is provide spare hydraulic pressure to the leading edge flaps and slats when hydraulic system B engine-driven pump pressure is abnormal.

C. The hydraulic power transfer unit system supplies alternate hydraulic pressure to the leading edge flaps and slats when hydraulic system B engine-driven pump pressure is below normal.

A. 如果仅仅损坏了轮胎中间表面，轮胎还是可用的。

B. 如果损伤是胎间见线，轮胎需要更换。

C. 如果损伤只局限于胎面中部，轮胎是可用的。

A. 控制组件的出口压力值，否则它不能稳定在正确压力范围。

B. 输出控制组件的压力，该组件不能稳定在正确压力范围。

C. 控制组件出口压力值不能稳定在正确压力范围。