单项选择题
When communicating on the radiotelephone using plain English，what procedure word indicates the end of my transmission and that a response is necessary? （）
A.Out B.Over C.Roger D.Wilco
单项选择题 To reduce the amount of catenary you may（）.
单项选择题 The Vessel Bridge-to-Bridge Radiotelephone Act applies to which towboat?（）
单项选择题 The Vessel Bridge-to-Bridge Radiotelephone Act applies to（）.
