498.关于性能数据库说法正确的是( ) which is correct,about performance database( )

　每隔28天更新 Updated every 28 days

　只能由厂家更新 Can only be updated by the manufacturer

　更换发动机后需要更新 After replaceing the engine,it is needs to be updated after

正确答案：B

解析：

题目解析关于性能数据库的描述中，只有"只能由厂家更新"是正确的。答案选择B，是因为性能数据库包含了飞机性能和性能计算所需的数据，这些数据会影响飞机的运行和性能计算。通常情况下，性能数据库是由制造厂家进行更新，以确保其中的数据是准确和最新的。

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A330机型熟悉课程试题

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204.显示被”EMER CANC”取消的警告( ) How to Show the warning cancelled by “EMER CANC”

203.正常构型下,PFD图形始终显示在( ) Under the normal configuration, PFD graphics displayed in( )

202.EFIS控制面板在( ) EFIS control panel is located on( )

201.襟/缝翼的位置指示在什么地方( ) Where does the slat/flap position indicates ( )

200.EFIS信息通常在( )显示 EFIS usually displayed information in ( )

199.时钟信号不输出到以下哪个部件( ) The clock signal is not output to which the following parts( )

198.FDR在下列哪种情况工作( ) FDR works in which of the following conditions( )

197.当ECAM控制板失效后,下列哪些按钮仍然有效( ) After the ECAM control panel failure, which of the following pushbutton is still valid ( )

196.FDIU的时钟信号一般来自于( ) Generally ,where is the clock signal of FDIU come from ( )

195.FDR的记录信号来自于( ) Signal from FDR's record