13.In designing schematic diagrams,it may be necessary to compromise between detail necessary to make the diagram self-explanatory and the simplicity essential for ease of reading and understanding.

A. 　定义的措词应尽可能简单,并且必须与手册中定义的术语相符。

B. 　定义的措词必须与手册中使用的定义术语一致,还应该用简单的方式来表达。

C. 　定义的措词应简单并符合手册中的术语。

A. 　If the microswitch stops working,deactivate the procedure of the actuator to avoid the valve damage.

B. 　If the microswitch becomes unserviceable,do the activation procedure of the actuator to prevent damage to the valve.

C. 　Do the activation procedure of the actuator to prevent damage to the valve,unless the microswitch becomes unserviceable.

A. 　如果剪切销断裂,检查拖把。

B. 　如果销钉断裂,检查拖把。

C. 　如果剪切销断裂,给拖把做测试。

A. 　如果能够启动发动机,继续完成当前测试。

B. 　如果能够启动发动机,执行适用的测试。

C. 　如果能够启动发动机,执行所有测试。

A. 　规范中包含一些新的材料和方法。

B. 　规范中几乎没有包含什么新材料或新方法。

C. 　规范中既不包含新材料,也不包含新方法。

A. 　Like warnings and cautions which must lines in the rear of the text,notes may precede or follow proper text up to the material to be emphasized.Warning,cautions and notes shall not provide procedural steps nor shall they be numbered.

B. 　Unlike warnings and cautions which must lines in the rear of the text,notes may precede or follow proper text up to the material to be emphasized.Warning,cautions and notes shall not provide procedural steps nor shall they be numbered.

C. 　Proper warnings and cautions shall be provided ahead of the text while notes may precede or follow suitable text up to the material to be highlighted,warning,cautions and notes shall not show procedural steps nor shall they be numbered.

A. 　在这个标题下,列出各个零件和部件中必要的问题,以便将必要的注意事项或关键点隔离开来

B. 　在这个标题下,列出各个零件和部件中必要的注意事项或关键点,以便将必要的问题隔离开来

C. 　在这个标题下,列出所有必要的注意事项或关键点,以便将各个零件和部件中的问题隔离开来。

A. 　This handbook includes the documents required to be finished to the pilot by the federal aviation regulations and additional information approved by the operator and contains the FAA approved airplane flight manual.

B. 　This handbook includes the material required to be furnished to the pilot by the federal aviation regulations and additional information provided by the manufacturer and constitutes the FAA approved airplane flight manual.

C. 　This handbook includes requirements of federal aviation regulations,material provided to pilot and accurate information provided by the manufactures,and establishes the FAA approved airplane flight manual.

A. 　Give long term protection to areas of bare metal since bare metal surfaces are usually unsatisfactory for an electrical bond.If there is corrosion on the surfaces,it will cause severe problems.

B. 　Give temper protection to areas of bare metal since bare metal surfaces are always satisfactory for an electrical bond.If there is corrosion on the surfaces,it will cause severe problems.

C. 　Protect the bare metal areas temporarily since this kind of surfaces are usually adequate for an electrical bond.If corrosion happens on the surfaces,it will bring serious problems.

A. 　各类出版物宜釆用水平页,不可釆用垂直页。

B. 　各类出版物可釆用垂直页,也可采用水平页。

C. 　各类出版物宜釆用垂直页,不宜釆用水平页。