The purpose of the spoilers is to disturb the smooth airflow across the top of the airfoil thereby creating an increased amount of drag and a decreased amount of lift on that airfoil.

A. Make sure the drain hose＇s open end is oriented in align with the structure.

B. Direct the open end of the drain hose away from the storage construction.

C. Ensure that the open end of the drain hose faces away from the structure.

A. 当这种情况发生时，你可以选择使用第9级引气。

B. 当这种情况发生时，将自动使用第9级引气。

C. 当这种情况发生时，人工打开第9级引气。

A. 转弯协调器感知并指示横滚和偏航的速度。转弯协调器中陀螺的转子向上倾斜30°。此时，它不仅响应纵轴上的运动，而且响应立轴上的滚动运动。

B. 转弯倾斜器感知并指示横滚和偏航率。转弯倾斜器中陀螺的转子向上倾斜30°。此时，它不仅响应立轴上的运动，而且响应纵轴上的滚动运动。

C. 转弯协调器感知并指示横滚和偏航率。转弯协调器中陀螺的转子向上倾斜30度。因此它不仅响应立轴上的运动，而且响应纵轴上的滚动运动。

A. In order to obtain additional clearance, gaskets may be added.

B. Additional shims may need to be added to obtain proper clearance.

C. Add special shims as necessary may vary the clearance.

A. “紧急程序”应该用红色塑料封袋装载以便区分。

B. “紧急程序”应该是由红色塑料板做成分隔页。

C. “紧急程序”应有一个红色塑料分隔标签。

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. Make sure you press the switch when you hear the boarding music.

B. Make sure you press the switch after you hear the boarding music.

C. Make sure that you hear the boarding music after you push the button.

A. Do not open the container if you are instructed that high pressure is dangerous.

B. If it states on the container that the pressure inside is high, do not open it.

C. If the instructions give a warning about dangerous pressure, do not open the container.

A. Removing it with special material is necessary if you find corrosion.

B. If you find corrosion, remove it with the specified material.

C. If corrosion is found, change the material to remove it.

A. Dust can contaminate all areas.

B. Dirts are contamination of all filters.

C. Dust can cause contamination on all filters.