在Visual FoxPro中，项目文件的扩展名是______。

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问题填空题

答案

参考答案：PJX

解析：在Visual FoxPro中，项目文件的扩展名是.pjx。

选择题

A．an underground lake was discovered	B．there was an underground lake discovered	C．the workers discovered an underground lake
D．a lake was discovered underground

问答题简答题

自动闭塞区段的出站色灯信号机显示两个绿色灯光时，显示含义是什么？