单项选择题 A vessel loads 5000 tons of manganese ore. The railroad cars that brought the ore to the vessel were previously loaded with iron ore so the ore is contaminated. The agent requests the Master to sign a Clean Bill of Lading and in return the shipper will give him a Letter of Indemnity. What is the best procedure to follow? （）

单项选择题 A single vessel being towed alongside shall exhibit（）.

单项选择题 A single line of position combined with a dead-reckoning position results in a(n)（）.