单项选择题 On your vessel，a wire rope for the cargo gear shows signs of excessive wear and must be replaced. In ordering a new wire for this 10-ton boom，what safety factor should you use?（）

单项选择题 On an anchor windlass，the wheel over which the anchor chain passes is called a（）.

单项选择题 On a long ocean tow，the bridle should be made up of two equal lengths of（）.