248.When a new paragraph starts,the reader knows that there will be new or different information in that paragraph.

A. The operator may use any format containing the same information.

B. The operator may use an equivalent form containing the same information.

C. The operator may use a diagram containing the same information.

A. Filling with oxygen is not permitted during defueling and refueling.

B. Servicing with oxygen is not allowed during refueling and defueling.

C. Servicing with oxygen is not prohibited during fueling and defueling.

A. 确保应答机正确发送信号。

B. 确保发射机正确发送信号。

C. 确保转换器正确接收信号。

A. When the cumulative revised pages (including back-up pages) exceeds 60% of the total pages of the manual,a reissue should be prepared.

B. If the updated pages,including back-up pages,were less than 60% of the total page of the manual,a new manual should be copied.

C. Up to 60% of total pages (including back-up pages) were accumulated by mistake,the manual should be rewritten.

A. 当必须理解原理图时,最好使用箭头来画出流动方向。

B. 当需要理解原理图时,应该使用箭头来指示流动方向。

C. 当需要理解计划表时,应该使用线条来指示流动方向。

A. Exhale into the oxygen mask.

B. Breathe into the oxygen mask.

C. Breathe into the gas mask.

A. Check wash basin drains,water tap and its lines for leakage.

B. Inspect the washing sink,faucet and its pipe for leakage.

C. Examine the washing hand drain port,tap and the line for crack.

A. 如果可行,应避免交叉。

B. 如果要进行施工,则应避免交叉。

C. 如果可行,各管路应避免干涉。

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. Functional check L VHF radio found statis interference and noise.

B. Functional check of L VHF radio shownturbulence and static noise.

C. Functional check of L VHF radio revealed interference of static with noise.