21 If none of the brackets are damaged,continue the procedure.

A. 　确保单向活门上的箭头指向远离地面供气管方向。

B. 　确保关断阀门上的箭头指向远离地面供应弯管方向。

C. 　确保调节阀门上的箭头指向偏离地面供应通道方向。

A. 　Ambient Air Temperature is the free static air temperature,attained from both inflight temperature indications and surface meteorological sources,adjusted for instrument error and compressibility effects.

B. 　Outside Air Temperature is the free air electrostatic temperature,contained neither from inflight temperature indications nor ground meteorological sources,adjusted for instrument error and compressibility effects.

C. 　Outside Air Temperature is the free air static temperature,obtained either from inflight temperature indications or ground meteorological sources,adjusted for instrument error and compressibility effects.

A. 　为了便于故障排除、应使用电路维修,部件更换及标识和编码系统。

B. 　为了加快故障排除及电路维修,应使用部件更换及标识和编码系统。

C. 　为了便于故障排除、电路维修和部件更换,应使用标识和编码系统。

A. 　当电表显示28伏特直流时,断路器闭合

B. 　当电表显示28伏特直流时,继电器闭合

C. 　当电表显示28伏特直流时,电磁阀闭合

A. 　中断起飞距离是使飞机加速至指定速度,并假设达到该速度的瞬间发动机发生故障,使飞机停卞来所需的距离。

B. 　中断起飞距离是使飞机加速至特定速度,并假设达到该速度的时候发动机发生故障,使飞机停下来 所需的距离。

C. 　中断起飞距离是使飞机加速至特殊速度,并即将达到该速度的瞬间发动机发生故障,与使飞机停下 来所需的制动距离。

A. 　A plasticized tab divider(when tabs are used)shall be used to mark each chapter,including the Introduction section to the manual.

B. 　Each Introduction section to the manual included shall be identified with a plasticized tab divider(when tabs are used).

C. 　A plasticized tab divider(when tabs are used)shall be marked in each chapter,including the Introduction section to the manual.

A. 　在这些情况下,俯仰的机械配平和电配平系统都将不工作。

B. 　当出现以下这些情况,俯仰的机械配苹而电配平索统都将继续工作。

C. 　在这些情况下,电配平系统都将继续工作,俯仰的机械配平不再工作。

A. 　If the temperature values are under the eligible limits,decrease the power.

B. 　Decrease the power as long as the temperature values are less than the certified limits.

C. 　Once the temperature values are more than the allowed limits,decrease the power.

A. 　如果飞机有一个内置的

B. 　如果飞机有一个附加的辅助电

C. 　如。 果飞机有一个内置的辅助动

A. 　将钢索临时安装在临近结构上。

B. 　将钢索永久安装在临近结构上。

C. 　将钢索临时安装在对面结构上。