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【单选题】

撤离警报是()

A.
高音频蜂鸣声
B.
3声双音式或以上呼叫铃声
C.
6声单音或以上呼叫铃声
D.
每隔30秒的钟鸣声
题目标签:警报
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参考解析:
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【单选题】C Federal regulators Wednesday approved a plan to create a nationwide emergence alert (警报) system using text messages delivered to cell phones. Text messages have exploded in popularity in recent year...

A.
To warn people of emergencies via messages.
B.
To popularize the use of cell phones.
C.
To estimate the monthly number of messages.
D.
To promote the wireless industry.

【单选题】警报按钮

A.
alarm button
B.
press button
C.
bell button
D.
bell key

【单选题】撤离警报是( )

A.
3声双音式或以上呼叫铃声
B.
6声单音或以上呼叫铃声
C.
高音频蜂鸣声
D.
每隔30秒的钟鸣声

【单选题】火警解除警报是:()

A.
一长声
B.
二长声
C.
三长声
D.
一短声