A、 This section includes all the limits of the optional systems and equipment.
B、 Limitations related to optional systems may be contained in this section.
C、 Only the limitations which are relevant to optional systems might be including in this section.
答案：B
解析：答案解析：B。这道题考察的是关于可选系统的限制性内容可能包含在哪个部分。选项A中说这部分包括所有可选系统和设备的限制，这是一个绝对化的说法，不准确。选项C中说只有与可选系统相关的限制可能包含在这部分，这也是一个绝对化的说法，不准确。选项B中说与可选系统相关的限制可能包含在这部分，是一个相对较为准确的描述，因此是正确答案。
生活中，我们也经常会遇到类似的情况。有些事物或者规定可能会有一些限制，这些限制可能会在相关的部分或者章节中进行详细说明，这样我们就能更好地了解和遵守这些规定。所以，当我们阅读相关内容时，要仔细留意可能存在的限制性内容，以免造成不必要的麻烦。
A、 This section includes all the limits of the optional systems and equipment.
B、 Limitations related to optional systems may be contained in this section.
C、 Only the limitations which are relevant to optional systems might be including in this section.
答案：B
解析：答案解析：B。这道题考察的是关于可选系统的限制性内容可能包含在哪个部分。选项A中说这部分包括所有可选系统和设备的限制，这是一个绝对化的说法，不准确。选项C中说只有与可选系统相关的限制可能包含在这部分，这也是一个绝对化的说法，不准确。选项B中说与可选系统相关的限制可能包含在这部分，是一个相对较为准确的描述，因此是正确答案。
生活中，我们也经常会遇到类似的情况。有些事物或者规定可能会有一些限制，这些限制可能会在相关的部分或者章节中进行详细说明，这样我们就能更好地了解和遵守这些规定。所以，当我们阅读相关内容时，要仔细留意可能存在的限制性内容，以免造成不必要的麻烦。
A. Staff must violate this procedure.
B. All persons must follow this procedure.
C. Personnel must deviate from this procedure.
A. Remove the sleeve to tighten the sliding tube.
B. Remove the sleeve to install the sliding tube.
C. Remove the sleeve to free the sliding tube.
A. The function and operation of each unit in the system should be described. The location of the units shouldn’t be described.
B. The function, operation and location of each unit in the system should be deleted.
C. The function, operation and location of each unit in the system should be described.
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. The function of the portable water system is to store and send drinking water to the passengers.
B. The potable water system must keep and transfer the water to the toilet for washing only.
C. The purpose of the drinking water system is to store and deliver the water for drinking.
解析：解析：这道题考察的是客车的车钩采用的是什么装置。鞍式复原装置是用于铁路机车的一种装置，用于连接车辆。而客车的车钩通常采用的是自动钩挂装置或者其他类型的连接装置，因此新造客车的车钩不会采用鞍式复原装置，所以答案是错误。
生活中，我们可以通过类比来理解这个知识点。就好比我们平时乘坐的公交车或者地铁，车厢之间连接的部分通常是通过自动钩挂装置来连接的，而不是铁路机车上使用的鞍式复原装置。这样就更容易理解客车的车钩不会采用鞍式复原装置这个观点了。
A. Do not perform any work to the aircraft during maintenance.
B. It is forbidden to refuel the aircraft during maintenance.
C. You can add fuel to the aircraft at any time.
A. Vertical pages instead of horizontal are preferred for all types of publication.
B. Horizontal pages are more preferable for all types of publication than vertical ones.
C. Both vertical and horizontal pages are rather preferable for all types of publication.
A. As the depressurization of the alternate system, the hydraulic system A must be released to open the rudder hydraulic system selector valve and permit hydraulic fluid to flow to the rudder actuator below.
B. In order to depressurize standby system, the hydraulic system A must be depressurized to open the rudder hydraulic system selector valve and let hydraulic fluid flow to the lower rudder actuator.
C. Due to the depressurization of the alternate system, the hydraulic system A must be released to open the rudder hydraulic system selector valve and permit hydraulic fluid to flow to the bottom rudder actuator.
A. There is enough oil.
B. Some oil must be drained.
C. More oil must be added.
解析：这道题考察的是对英语中"enough"和"sufficient"的理解。在题干中说油箱里有足够的油，这里的"sufficient"和"enough"都表示"足够的"意思。在选项中，选项A说"There is enough oil."，意思是"有足够的油"，符合题干的意思，所以答案是A。
举个生动的例子来帮助理解，就好比你在煮面条时，如果水里有足够的水，面条就能够被充分煮熟。这里的"足够的水"就可以用"enough water"或"sufficient water"来表达。
A. The usual control for the left pack ensures that it supplies air at a temperature. The temperature gives the occasional cooling for the flight compartment.
B. The normal control for the left pack makes sure that it supplies air. The cooling provides the necessary temperature for the flight compartment.
C. The usual control for the left pack assures that the temperature of the supplied air will provide the control cabin with the needed cooling.
