Contamination of cabin air can be an important problem.

A. The filter must be replaced before putting new oil in the system.

B. The replacement of the filter is optional before refueling the system.

C. The filter can not be replaced unless you put new oil in the system.

A. The glideslope path is at a constant angle to the threshold of the runway.

B. The glideslope path is at a variable angle to the first end of the runway.

C. The vertical course path is at a fixed angle to the threshold of the runway.

A. 打破了测量值的记录。

B. 打破了一个金属测量值的记录。

C. 对所有厚度测量值做记录。

A. The fairway and the runway centerline should align .

B. The localizer course is aligned with the centerline of the runway.

C. The localizer aligns with the center of the runway.

A. Use multipurpose plate driver to load flight management data.

B. To upload flight management data, you can utilize multi-function disc generator.

C. Download the flight management data with the multipurpose disk drive unit.

A. 程序应在每章内按编号顺序进行准备，并有适当的主次科目标题，无需从新的页面开始。

B. 程序应在每章内按照主次标题和参考号的形式进行编写，不需要从新的页面的开头开始。

C. 程序应在每章内按参考编号顺序编制，并有适当的主、副标题，而无需从新页的顶部开始。

A. 本程序指出，在飞机进行任何改装之前，应联系美国联邦航空局，以确保不违反飞机的适航性。

B. 本程序指出，在飞机进行任何改装之前，美国联邦航空局应与厂家确认其不违反飞机的适航性。

C. 本程序指出，在飞机进行任何改装之初，应联系美国联邦航空局，以确保飞机的适航性。

A. 齿轮箱部分包括齿轮、曲柄、密封件、油箱、冷却器等。

B. 齿轮箱部分包括叶轮、轴、密封件、油泵、冷却器等。

C. 齿轮箱部分包括齿轮、轴、密封件、油泵、冷却器等。

A. 系统接口电路适配已连接系统的物理特征。

B. 系统的电路跳开关符合连接系统的物理特性。

C. 系统电路的物理特点与所连接系统相匹配。

A. The reserved 45 minutes for use in aircraft cruising power shall be calculated. Chart should provide information of the calculation method for the reserve.

B. To reserve 45 minutes for the flight at cruising power is calculated. The calculation method of reserves should provide additional diagrams and related instructions.

C. Reserve shall be computed as 45 minutes at the cruise power to be used for the flight. The explanation information presented with the chart should explain how the reserve was computed.