单项选择题
To reduce the amount of catenary you may（）.
A.shorten the hawser or increase the tug's speed B.lengthen the hawser or reduce the tug's speed C.place your tug in irons D.make a sharp turn
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（）.
单项选择题 The unit of duration of a dash in Morse Code is（）.
