单项选择题
Which may ignite fuel vapors?（）
A.Static electricity B.An open and running motor C.Loose wiring D.All of the above
单项选择题 Where would you find the call sign or call letters of the radio station on your ship?（）
单项选择题 To safely anchor a vessel there must be sufficient scope in the anchor cable. Scope is the ratio of（）.
单项选择题 Three SHORT BLASTS mean（）.
