1553.Illustrations should be used whenever they will simplify,shorten or make the text easier to understand.

A. 确保应答机正确发送信号。

B. 确保发射机正确发送信号。

C. 确保转换器正确接收信号。

A. 如果不实施保护,这种材料会导致表面腐蚀。

B. 在没有保护的情况下,这种材料的表面会出现腐蚀。

C. 这种材料会腐蚀未受保护的表面。

A. An "Airplane Weighing Form" shall be included in each handbook and the form shall contain an airplane side view that shows the location of weighing points (using jacking points or landing gear) relative to the datum line.

B. Each handbook shall provide an aircraft side view that is included in an "Airplane Weighing Form" to show the position of weighing points (using jacking points or landing gear) related to the datum line.

C. An airplane three view that shows the weighing points ((using jacking points or undercarriage) relative to the datum line shall be excluded in an "Airplane Weighing Form" of each handbook.

A. The layout does not rely on devices that require power such as computers.

B. The format should not rely on devices such as a power computer.

C. The forms should be independent from any equipment,computers are suitable.

A. The space equipment releases the air from the compound.

B. The vacuum equipment decreases the air from the compound.

C. The vacuum equipment removes the air from the compound.

A. 对 2 号引擎进行排故。

B. 对 2 号发动机进行大修。

C. 对 2 号发动机进行校验。

A. Drill the hole until it has a radius of 8.00 +/- 0.003 mm.

B. Ream the hole until it has a diameter of 8.00 +/- 0.003 mm.

C. Trim the hole until it has a width of 8.00 +/- 0.003 mm.

A. The incorrect operation of the connection units will result in a dirty contact.

B. A dirty contact in the connection units will cause them to operate incorrectly.

C. Improper operation of the connection units might be attributed to a dirty contact.

A. 自主式定位包括惯性制导系统、天气雷达、多普勒、接近预警、避撞、星体跟踪器等部分,以及六分仪/八分仪等。

B. 自主式定位包括导向系统、天气雷达、多普勒、近地警告、避撞、星体雷达等部分,和六分仪/八分仪等。

C. 自主式定位包括导向系统、天气雷达、多普勒、接近预警、避撞、星形跟踪器等部分,和六分仪/八分仪等。

D. B.自主式定位包括导向系统、天气雷达、多普勒、近地警告、避撞、星体雷达等部分,和六分仪/八分仪等。

E. C.自主式定位包括导向系统、天气雷达、多普勒、接近预警、避撞、星形跟踪器等部分,和六分仪/八分仪等。

A. 全推力情况下,刹车必须能够防止飞机移动。

B. 在最大推力下,制动器必须防止飞机摆动。

C. 在全推力情况下,刹车必须防止飞机启动。