第二章 单元测试

1、单选题:
Which of the following words and phrases means “Listen out on (frequency)”.( )
选项:
A:break
B:standby
C:cleared
D:monitor
答案: 【monitor

2、单选题:
Which of the following words and phrases means “I hereby indicate the separation between portions of the message” ( )
选项:
A:break break
B:standby
C:break
D:cleared
答案: 【break

3、单选题:
Which of the following

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