Adjust the clinometer until the bubble is in the center.

A. 发动机系统包含元件和部件用于控制和改变润滑剂在发动机入口和出口的流动。

B. 发动机系统包含控制和引导润滑油从进口流向出口的组件和部件。

C. 润滑剂靠发动机的元件和部件的控制和引导在发动机里产生流动。

A. Proper recipe shall be adopted to measure the pressure.

B. The pressure shall be estimated by using accurate equation.

C. Calculate the pressure with the applicable formula.

A. Mach digit is the percent of true airspeed to the speed of sound.

B. Mach number is the ratio of true airspeed to the speed of sound.

C. Mach number is the proportion of real airspeed to the speed of light.

A. 需要对特征或特点的补充描述，使数据更加完善。

B. 若有需要，对附加的特征或特性加以简明描述，可以使数据得到补充。

C. 若有需要，指标的额外特征或特性将是其原有基础描述上的补充。

A. 仔细评估损伤区域。

B. 仔细测量损伤区域。

C. 仔细评估磨损区域。

A. The index of the maintenance manual shall be comparative to the basic standard category of Part 20. Manufacturers may, however, delete systems or sections that do not apply to their products or, where practicable, combine systems or sections.

B. The index for maintenance manuals shall be compatible with the basic standard breakdown of Section 20. However, manufacturers may omit system or chapters that are not applicable to the product or combine system or chapters where it is feasible.

C. The basic standard category of Part 20 must conform to the index of the maintenance manual. However, manufacturers may elide systems or sections that are not applied to their products, or incorporate systems or sections where applicable.

A. The compressor needs to be equipped with a pressure regulator, air hoses, and an appropriate filter system to ensure that clean, dry, oil-free air is delivered to the nozzle.

B. A press regulator, air ducts, and a proper filtration system form the compressor, which surely delivers clean, dry, oily air to the spray nozzle.

C. For the compressor that ensures clean, dry, oilless air is delivered to the injector, it is necessary to be equipped with a pressurization regulator, air pipes, and an adequate filter system.

A. If the error is more than 3 degrees, calibrate the glide slope.

B. If the error is more than 3 degrees, calibrate the compass.

C. If the error is more than 3 degrees, calibrate the gyroscope.

A. 灯泡带来了一盏灯。

B. 这灯发出微弱的光。

C. 这灯发出了亮光。

A. Do not give vague, general information.

B. Do not provide clear, general information.

C. Do not list complex, valid information.