原则上，出现挤提苗头或发生挤提事件要（）报告.
A.一日内
B.立即
C.三日内
D.五日内
参考答案：B
At the meeting place of the Yangtze River and the Jialing River________,one of the ten largest cities in China
A．lier Chongqing
B．Chongqing lies
C．doer lie Chongqing
D．doer Chongqing lie
如何使用手提式ABC干粉灭火器？
