If the oil leakage is more than five drops a minute, examine the sealant.

A. When the temperature is below zero, depressurize the water system.

B. If the temperature drops below zero, deflate the water system.

C. If the temperature decreases to less than zero, drain the water system.

A. 另外，它应提供手册中使用的符号、缩略语和术语的定义或解释。

B. 另外，它应提供象征的定义或解释、缩略语和手册中使用的术语。

C. 另外，它应提供符号和缩略语的定义或解释、以及手册中使用的技术。

A. Horsepower Radius and Engine Revolving Speed

B. Horsepower Ratings and Propeller Rotational Speed

C. Horsepower Values and Propeller Turning Speed

A. 描述飞机发动机时，应简要阐述异常运行。应保持在最低限度以帮助飞行员纠正形势或使他能够向机械师描述情况。它不应是一个维修程序。

B. 描述飞机发动机时，应简要阐述非正常运行。应在最低限度帮助飞行员改正情况或使他能够向机械师描述情况。它不应是一个维修程序。

C. 描述飞机发动机时，应对非正常运行情况进行简要描述。应以帮助飞行员纠正非正常情况或使其能够向机械师描述非正常情况为宜。无须是具体的维修程序。

A. Metal objects attract magnetic interference.

B. Magnetic interference can occur to the metal objects.

C. Metal objects can cause magnetic interference.

A. Wait for the paint to dry completely before polishing it again.

B. Do not apply the second layer of paint if the first layer has dried thoroughly.

C. Let the first layer of paint dry fully before you apply the second layer.

A. This compound can eliminate poisonous fumes.

B. This compound can release poisonous fumes.

C. This composite alloy can release poisonous fumes.

A. 如果飞机在地面，系统的出口保护控制面不受风的吹动。

B. 尽管飞机在地面，保护系统的这部分控制风的移动面。

C. 当飞机在地面上时，系统的这部分防止操纵面受风的影响而运动。

A. This is an installation procedure used by this typical fastener type.

B. This installation procedure is typical for this type of fastener.

C. It＇s typical to install the fastener according to this procedure.

A. 将管子截成正确的角度。

B. 将管子放置在正确的位置。

C. 把管子弯到正确的半径。