A. 不报警 B. 一级报警 C. 二级报警 D. 三级报警
A. 正确 B. 错误
A. 5.5~6.5m,5.0~7.0m,4.5~7.5m B. 5.0~7.0m,4.5~7.5m,5.5~6.5m C. 5.0~7.0m,5.5~6.5m,4.5~7.5m D. 4.5~7.5m,5.5~6.5m,5.0~7.0m