2619.改变频率并记录结果。

A. Make sure that the scale is not more than 400 knots.

B. Make sure that the indication is not more than 400 knots.

C. Make sure that the indication is not more than 400 miles.

A. 在记录卡上做登记。

B. 在记录本上做账目。

C. 进入到记录本的登记中。

A. 技术动词是指示性的词汇,提供有关特定技术和操作的信息。

B. 技术动词用于描述指示和信息,以适用于特定的技术和操作环境。

C. 技术动词在特定的技术和操作语境中给出指示和信息。

A. It includes items such as audio selector control panel,microphones,head- phones,cockpit loud speakers,etc.

B. It includes items such as automatic selector control panel,interphones,head- phones,cockpit loud speakers,etc.

C. It includes items such as audio selector control panel,microphones,head- phones,cockpit speakers,etc.

A. 拆除所有阻止操纵舵面自由移动的校装销和设备。

B. 拆下所有的插钉和设备使操纵舵面自由移动。

C. 拆下所有的开口销,并移走防止操纵舵面自由移动的设备。

A. Clean the surface to make sure that the sealing is satisfactory.

B. Clean surfaces to ensurethe bonding as required.

C. Clean the surface to make sure that the bond is satisfactory.

A. 如果无法听到警告声,需调整音量控制器。

B. 调整音量控制器可能导致警告声过于响亮。

C. 调整音量控制器可能使警告声变得更加嘈杂。

A. Do not extend or retract landing gear above this speed.

B. Do not expand or retract landing gear at this speed.

C. Do not put down or retract landing gear by more than this speed.

A. Due to the incorrect level of pressure,the system will not work.

B. As long as the fluid level remains unstable,the system will fail.

C. Because the fluid level is incorrect,the system will not operate.

A. 如果不遵守特殊预防措施,机械员打开舱门时很容易造成站在门附近的人员受伤。

B. 打开车门的机械员没有遵守规舱定的安全预防措施,造成了站在附近的人员受伤。

C. 机械员在未遵守规定的安全预防措施的情况下打开舱门,很容易造成站在舱门附近的人员受伤。