How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?（）

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? （）

A seaman is entitled by law to a release from Foreign Articles when（）.

A series of trays with sieves that vibrate to remove cuttings from the circulating fluid in rotary drilling operations is called the（）.

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

Hygroscopic cargoes should be ventilated when（）.

A ship having continuous closely spaced transverse strength members is（）.

A single barometric pressure reading of 28.60 indicates（）.

A seaman may have all or part of his wages deposited by allotment to a bank or savings institution. Which of the following is NOT a requirement for this type of allotment? （）

A semisubmersible with a negative GM flops to an angle of（）.