On a ship，a cabinet or space containing the controls or valves for the fixed firefighting system must be（）.

A.posted with instructions on the operation of the system

B.ventilated and equipped with explosion-proof switches

C.painted with red and black diagonal stripes

D.equipped with a battery powered source of emergency lighting

拨号提示错误代码“718”有可能是宽带接入服务器故障，宽带用户太多超过接入服务器所能提供的IP地址。