Make sure that the fluid that goes through the tube has no bubbles.

A. Schematic diagram designers may make a compromise so as to add more details to make the diagram self-explanatory and keep its simplicity at the same time for ease of reading and understanding.

B. In designing schematic diagrams, it may be necessary to pay attention to both detail that is necessary to make the diagram self-explanatory, and simplicity that is essential for ease of reading and understanding.

C. Detail makes the diagram self-explanatory. Simplicity makes it easy to read and understand. It is necessary to consider both of them and make a compromise if needed when designing schematic diagrams.

A. Schematic diagrams may be used to indicate "flow" and to illustrate the operation of systems such as air control, electrical, fluid power, fuel and turbosystems.

B. Principle charts can be intended to show "flow" and explain the operation of systems as well as air control, electrical, hydraulic power, fuel and turbine systems.

C. Schematic diagrams can be employed to show "flow" and to explain the operation of systems along with air control, electrical, fluid power, fuel and turbosystems.

A. 门指用于进、出以及用于封闭机身内包含的其他结构的可拆卸组件。包括乘客和机组舱门、货舱门、紧急出口等，以及如恰当，还包括电气和液压系统中与门控制相关的部件。

B. 门包括可拆卸的用于连接进口和出口的单元，也用于阻断与机身相连。包括乘客和机组人员门、货舱门、紧急出口等，视具体情况考虑是否包括与门控制相关的电子和液压系统。

C. 门包括可拆卸的单元用于连接进口和出口，也用于连接与机身相关的其他结构。包括乘客和机组人员门、货舱门、紧急出口等，视具体情况考虑是否包括与门控制相关的电力和液压系统。

A. 那些机载动力装置被安装在飞机上，用于产生并提供单一类型或组合的辅助电力、液压、气源或其他动力。

B. 那些空气动力的发动机被安装在飞机上来运行并提供一类或多类的辅助电力、液压、气源或其他动力。

C. 那些利用空气产生动力的装置装在飞机上来获得和补充单一或多个备用电源、液压源、气源或其他动力。

A. Accumulate the thickness of the shim as follows: t=x-y.

B. Calculate the thickness of the shim as follows: t=x-y.

C. Calculate the width of the shim as follows: t=x-y.

A. 某些油箱被称为配平油箱，因为它们不仅储存燃油，也用于飞机配平．

B. 飞机上一些油箱用于储存燃油，一些油箱用于飞机配平，所以叫做配平油箱。

C. 飞机上用于储存燃油的油箱需要用空气进行配平．这个过程叫配平油箱。

A. 本章应提供制造商认为必要的信息，以便在飞机使用寿命期内可能需要进行的各种维修、大修或重大维修时正确校平飞机。

B. 本章提供制造商认定的必要信息用以保证飞机在全寿命期中进行各种维护，翻修或大修后正确校准飞机。

C. 本章提供制造商确定需要的信息用以保证飞机在运行期间进行各种维修，翻修或大修后适当配平飞机。

A. The repair limits are not permitted as special equipment is required.

B. The repair limits are not mentioned as special equipment is required.

C. The repair limits are not set as special equipment is required.

A. You can not remove the battery. Only an approved service provider can replace it.

B. Do not replace the battery. Only an approved service provider can replace it.

C. Do not replace the battery. Only an approval of a service provider can replace it.

A. Correct punctuation is important because it shows that the different parts of the text are reconnected and prevents miscomprehension.

B. Correct punctuation is important because it shows how the different parts of the text are independent and prevents accumulation.

C. Correct punctuation is important because it shows how the different parts of the text are related and prevents ambiguity.