A.10s B.30s C.60s D.100s
A.0030時(shí) B.0140時(shí) C.0250時(shí) D.0320時(shí)
A.氣象預(yù)報(bào) B.航行警告 C.冰況報(bào)告 D.必須打印的搜救信息