499、Manually override the start sequence.

A. 　The turbine rotates by a reduction gear gives tolerance to the HP shaft, so it can drive the engine and the
aircraft accessories.

B. 　 The turbine turning through a reduction gear,applies a torque to the HP shaft, thus driving the engine
and the aircraft components.

C. 　The turbine turning through a reduction gear, applies a torque to the HP shaft, thus driving the engine and
the aircraft accessories.

A. 　对所有维修过的产品进行全面检查。

B. 　对所有维修过的产品进行仔细检查。

C. 　对所有维修过的产品进行初始检查。

A. 　这种物质在高浓度时是有毒的。

B. 　在高度浓缩后,这种材料会有毒。

C. 　这种材料在高温下会易燃。

A. 　 This section provides procedures to calculate weight and moments for different phases of a scheduled
flight and to make sure that the center of thrust is beyond approved limits.

B. 　 The paragraph gives the weight and moments for calculating all kinds of phases of a planned fight and
procedures for ensuring that center of gravity is within authorized limits.

A. 　 There are electrically-operated valves in the injection lines to the two engine pumps.

B. 　 There are electronic-operated valves in the ejection lines to the two engine pumps.

C. 　 There are electrically- operated valves in the suction lines to the two engine pumps.

A. 　 For normal operations, make sure the pressure relief valve is closed. An open pressure relief valve is a
symptom of a problem in the fuel vent system.

B. 　 For normal operations, make sure the shut off relief valve works; lf you open pressure relief valve, that
indicates a problem in the fuel vent system.

C. 　 For normal operations, make sure you close the pressure relief valve. lf you leave it open a problem will be
shown in the fuel vent system.

A. 　 Review the failures report from the logbook and related fault messages with center DU or CDU, debrief
the flight crew for faults and report them for handling.

B. 　 Either the logbook or center DU/CDU shall be checked for faults records and related fault information,
then review the faults reported by the flight crew and take actions.

C. 　 Consult the failures report from the logbook to find the related information on center DU or CDU, listen to
the crew for faults report. Report faults and handle them

A. 　如果不能安全执行此地面移动操作,警告不要再次尝试它

B. 　如果不能安全执行此操作,应提供警告不要再次尝试此操作。

C. 　如果不能安全执行此操作,应提供警告不要尝试此操作。

A. 　不要拧紧螺母去压紧它

B. 　 不要旋转螺母去校准它

C. 　不要拧松螺母去对准它

A. 　通风系统使飞机产生不同的压力从而将废气排出。

B. 　飞机利用通风系统将空气排出机外。

C. 　通风系统利用压差将空气排出飞机,