A、 The filter must be replaced before putting new oil in the system.
B、 The replacement of the filter is optional before refueling the system.
C、 The filter can not be replaced unless you put new oil in the system.
答案：A
A、 The filter must be replaced before putting new oil in the system.
B、 The replacement of the filter is optional before refueling the system.
C、 The filter can not be replaced unless you put new oil in the system.
答案：A
A. Section 1 of the Pilot＇s Operating Handbook shall introduce basic data and information of general interest to the pilot. The data and information is useful in loading, sheltering, handling, and routine preflight checking of the airplane.
B. Section 1 of the Pilot＇s Operating Handbook shall present basic data and information of general interest to the pilot. The general interest is useful in loading, sheltering, handling, and routine preflight checking of the airplane.
C. Section 1 of the Pilot＇s Operating Handbook shall present basic data and information of general interest to the pilot. The pilot is useful in loading, sheltering, handling, and routine preflight checking of the airplane.
A. The routing of the cable loom may have been altered by the installation.
B. The routing of the cable loom may have been held by the installation.
C. The routing of the cable loom may have been defended by the installation.
A. Those units means that they can prevent it from eroding.
B. Those units provide a method of deicing.
C. Those units provide a way to prevent the formation of ice.
解析：这道题考察的是关于防止结冰的方法。选项A中提到防止侵蚀，与题目中提到的防止结冰不符；选项B提到除冰方法，与题目中提到的防止结冰类似，但不完全符合；选项C提到提供一种防止结冰的方式，与题目中的意思一致，所以答案应该是C。
为了更好地理解这个知识点，我们可以通过生动的例子来帮助理解。想象一下，当天气变得非常寒冷时，我们的车窗可能会结冰，这会给我们的驾驶带来很大的困难。为了防止车窗结冰，我们可以使用一种特殊的喷雾剂，这种喷雾剂可以在车窗上形成一层薄薄的保护膜，防止冰的形成。这种喷雾剂就像题目中提到的那些单位，提供了一种防止结冰的方式，让我们的车窗保持清晰，确保我们的安全驾驶。
A. Find out which door has a fault and is closed.
B. Make sure that which door has a failure.
C. Find out which door has not closed.
A. For purposes of this specification, "aircraft" means the relevant optional parts of the airframe and parts specified in the type certificate or supplied by the aircraft manufacturer
B. For the intention of this specification, " airplane" is know as the airframe selective components set forth in the Type Certificate or provided by the airplane producer.
C. For purposes of this specification, "aircraft" means the airframe and parts specified in the Type Certificate or the related optional parts supplied by the aircraft manufacturer.
A. If the pump is not suitable to be used, replace it.
B. If the pump is outmoded, replace it.
C. If the pump malfunctions, change the location for it.
解析：这道题考察的是逻辑推理能力。句子的意思是如果水泵无法维修，就应该更换它。选项A符合题意，因为unsuitable意思是不适合使用，与unserviceable意思相近，所以是正确答案。
举个生动的例子来帮助理解：假设你的手机屏幕坏了，修理店告诉你无法维修，只能更换新的屏幕。这种情况下，你会选择更换新的屏幕，因为旧的屏幕已经无法继续使用了，就像题目中提到的水泵无法维修一样。所以正确的做法是选择更换新的屏幕，就像选择选项A中的意思一样。
A. During antenna installation, disregard the direction the alignment arrow is pointing.
B. Align the antenna in the opposite direction in consideration of the alignment arrow in installation.
C. When installing the antenna, make sure the alignment arrow is directed towards the front.
A. Light L4 illuminates within 5 seconds.
B. Light L4 comes on after 5 seconds.
C. Light L4 comes on 5 seconds before.
A. Rivets can be used to separate the two stringers.
B. You can use two rivets to attach the stringers together.
C. Use rivets to connect the two stringers together.
A. English is not often the mother language of the readers of technical files.
B. English is not often the private language of the readers of technical books.
C. English is not often the required language of the readers of technical pamphlet.
