504.在钢表面上涂油。( )

A. 　System test contain part of the adjustment specifications and tolerances.

B. 　System test is required to maintain a unit performance at its lowest design specifications.

C. 　System test may cover other tests, such as operational test.

A. 　确保表显数值与油箱加油量一致。

B. 　确保设备测量值与燃油箱的实际油量一致。

C. 　确保仪表上的指示与油箱内的油量一致。

A. 　The airplane is not certified for takeoff if it installs the autopilot system.

B. 　The airplane is certified for takeoff with the autopilot Engaged

C. 　With the autopilot engaged, airplane is uncertified for takeoff.

A. 　Before you use a word, read its definition in the approved meaning column of the dictionary.

B. 　Before you use a word, read its approved meaning in the definition column of the dictionary.

C. 　Before you use a word, read its meaning in the approved column of the dictionary definition.

A. 发动机试车时，如人员需接近发动机（最小慢车渗漏测试），必须进入接近通道

B. 当人员接近通道时，发动机运转功率不能高于慢车

C. 安全起见，建议使用安全绳索，进气道栅栏或进气道保护罩

D. 以上都是

A. 　因 CAP 是针对特定的零件或部件,可得知检查将包括对零件和设备周围区域的观察和评估

B. 　由于 CAP 是针对特定的零件或部件,可推测出检查将包括对零件和设备周围区域的观察和评估

C. 　只要 CAP 是针对特定的零件或部件,就意味着检查将包括对零件和设备周围区域的观察和评估

A. 　The emergency exit doors are known as, backup exit and they should not be used in special condition.

B. 　The emergency exit doors are used for the escape and are not used as the normal exits.

C. 　The emergency exit doors are applied to board that are not usually used for exit.

A. 　COMMENCE

B. 　START

C. 　ACTIVATE

A. 　飞行员呼叫开关位于 P19 外部电源面板上。该面板位于飞机右侧的前轮上方。

B. 　飞行员呼叫开关位于 P19 外部电源面板上。该面板位于飞机右侧的前轮舱前方。

C. 　飞行员呼叫开关位于 P19 表面电源面板上。该面板位于飞机右侧的前轮上方。

A. 　It is the responsibility of the operator to ensure that alternative tools or equipment can work well and are dangerous to the parts and personnel as the ones specified in the procedure if you use them.

B. 　If alternative tools or equipment are used, the operator must ensure that they can play the same role and are as safe as the tools or equipment specified in the procedure to the parts and personnel.

C. 　If the manufacturer can make sure that alternative tools or equipment can meet the requirement and are as safe to the parts and equipment as the ones specified in the procedure, you can use them.