253.Make sure that the indications agree with the position of the flaps.

A. The Boeing-777 airplanes are different from the previous Boeing series ones mainly in that they are flown by wires.

B. The difference between the Boeing-777 airplanes and the subsequent Boeing series is that they are operated by wires.

C. Fly-by-wire is the main difference between Boeing-777 airplanes and the subsequent Boeing series.

A. Do not put too much force on the brush when cleaning the carpet which can be easily damaged.

B. To prevent damage to the carpet when you clean it,do not use too much force on the brush.

C. Using too much force on the brush when cleaning the carpet will cause damage to it.

A. 如果发动机灭火系统可以使用,描述,给出操作原则,并说明如何使用。

B. 如果有发动机火警探测系统,描述、给出工作原理,并说明如何使用。

C. 如果发动机火警探测系统正常工作,描述,给出操作方法,并说明如何使用。

A. This step is applied to primer layer only.

B. This step can be only applied when the top is painted.

C. This step is applicable only when you apply the top layer of paint.

A. 数据应显示外界温度、高度和风与起飞距离的关系。应包括地面滑跑距离和飞机达到高于地面 50 英尺的总起飞距离。达到这些距离所需的速度需应以指示空速给出。

B. 数据应显示为距离与外界大气温度、高度和风的关系。应包括地面滑跑和超过 50 英尺障碍物的总距离。达到这些距离所需的速度应在指示空速中规定。

C. 数据应以起飞距离与外界空气温度、高度和风力的关系来表示。地面横滚和 50 英尺障碍物的总距离都应包括在内。达到这些距离所需的速度应以指示空速进行计算。

D. C.数据应以起飞距离与外界空气温度、高度和风力的关系来表示。地面横滚和 50 英尺障碍物的总距离都应包括在内。达到这些距离所需的速度应以指示空速进行计算。

A. The description could be pronounced in the active voice.

B. Descriptive content can be written in active voice.

C. You should read it in voice as you write the descriptive text.

A. 机务使用方向盘操纵飞机在滑行期间的方向。

B. 机组在推出期间通过转弯手轮控制飞机方向。

C. 机组在用方向盘后退期间控制飞机方向。

A. The flight deck is located between the pressure dome and the front passenger door,and it is above the floor.

B. Cockpit is on the floor panel and between the pressure dome and the rear passenger partition.

C. Flight compartment is above the floor and between the forward passenger partition and the forward pressure dome.

A. 封面上的信息将由制造商自行决定。

B. 封面包含的信息将由制造商保留。

C. 封面必须包含制造商保留的信息。

A. LCD 背光强度从飞机调光汇流条中获得并测量驾驶舱内的周围光线。周围光线由前挡板上的光电二极管检测到。

B. LCD 背光强度是从飞机调光汇流条和对驾驶舱内环境光的测量获得。环境光由位于前挡板上的光电二极管感应。

C. LCD 背光强度从飞机调光总线中获得,测量驾驶舱内的适当光线。合适的光线由前挡板上的光电二极管检测到。

D. 背光强度是从飞机调光汇流条和对驾驶舱内环境光的测量获得。环境光由位于前挡板上的光电二极管感应。

E. C.LCD 背光强度从飞机调光总线中获得,测量驾驶舱内的适当光线。合适的光线由前挡板上的光电二极管检测到。