单项选择题 Where are the test certificates，for wire rope used as cargo runners，and loose gear certificates usually maintained? （）

单项选择题 When should you conduct a visual inspection of your towline? （）

单项选择题 When inspecting a tank barge to see that it has all the required fire extinguishers and other safety items aboard，which of the following is the best source for determining what is required? （）