单项选择题
What happens to the pulling power of a winch when retrieving wire rope?（）
A.It increases B.It decreases C.It remains the same D.It fluctuates，depending on the gearing system
单项选择题 What fitting on the mast works in conjunction with the shrouds to control side bend of the mast?（）
单项选择题 What does the term end-for-end refer to in regard to a wire towing hawser?（）
单项选择题 What can be used to measure the percentage of oxygen inside a chain locker?（）
