题目内容

lesson 17 听一遍，选择正确答案

A. end of radar contact
B. radar contact lost
C. radar contact established
D. visual contact established

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A. radar failure
B. transmitter failure
C. receiver failure
D. transceiver failure

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B. Transmitter failure
C. Receiver failure
D. radar failure

A. possible TCAS system failure
B. Engine disintegrated
C. Engine shut-down
D. foreign object ingestion

A. 导入 Tkinter 库
B. 创建控件
C. 声明头文件
D. 导出Tkinter模块