2.List these sections under each trouble in order of probability.

A. 　除非有必要了解系统,否则不需要完整地显示回流管。

B. 　如果没有必要了解系统,则需要完整地显示回流管。

C. 　除非需要了解系统,则需要新分地显示回流管。

A. 　对于使用寿命长的飞机应进行检查以协助选择检查项目,大修时应进行拆卸。

B. 　为了大修而拆卸的及时飞机,应被检查以协助选择检查项目。

C. 　为了协助选择检查项目,应检查并拆卸使用寿命长的飞机进行大修。

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.

A. 　可以从 ABC 经销商或工厂客户服务代表处获得相应表格的副本和需要填写条目的说明。

B. 　ABC 经销商或工厂客户服务代表处需获取相应表格的副本和需要填写条目的说明

C. 　ABC 经销商或工厂客户服务代表处必须提供相座表格的副本和需要填写条目的说明。

A. 　Loosen and remove nut with wrench.

B. 　Tighten and torque nut with spanner.

C. 　Remove and replace nut with wrench.

A. 　The objective of minimizing the cost to,and efforts of general aviation aiiplane owners and operators personnel is to develop the Specification by standardizing the foiTnat and general content of Continuing Airworthiness Programs

B. 　The purpose of developing the Specification is to minimize the cost to,and efforts of general aviation airplane owners and operators and maintenance personnel by the standardization of the format and general content of Continuing Airworthiness Programs

C. 　The aim of making the Specification is to standardizing the format and general content of Continuing Airworthiness Programs by minimizing the cost to,and efforts of general aviation airplane owners and operators and maintenance personnel

A. 　再次启动发动机前,清除地面燃油。

B. 　再次启动发动机前,拆除燃油管。

C. 　启动发动机前,清楚地面杂物。

A. 　These tests should require no special equipment or facilities rather than that installed on the aircraft and should be comparable to the test performed by the flight crews.

B. 　These tests should require no special equipment or facilities other than that installed on the aircraft and should be comparable to the test performed by the flight crews.

C. 　These tests should require none special equipment or facilities other than that installed on the aircraft and should be comparable to the test performed by the flight crews.

A. 　When you need to understand a schematic diagram,use arrows to indicate flow orientation.

B. 　Arrows shall be used to signify flow direction when needed to realize the schematic form.

C. 　When need to comprehend the chart,you should use arrows point to the direction.

A. 　涂上两层保护性化合物,防止液压油损害密封胶。

B. 　涂上两层保护密封胶,以防止液压油损害混合物

C. 　在无保护的表面涂上两层密封胶,防止液压油损害化合