Many businesses ship their products by rail if they are shipping long distance because it can be（）to ship in large quantities by rail than by truck.A、more expensiveB、cheaperC、fasterD、safer

Which statement about damage control is TRUE ________．

A.A hole in the hull at the waterline is more dangerous than a hole below the inner bottom

B.The amount of water entering a ship through a hole varies inversely to the area of the hole

C.Water flowing into a lower compartment on a ship is more dangerous than water on deck or flowing into an upper compartment

D.Water flowing over the forecastle bulwark is more dangerous than a hole in the hull at the waterline

The velocity of the apparent wind can be more than the true wind，and come from the same direction，if certain conditions are present．One condition is that the ______．

A.Ship's speed must be less than the true wind velocity

B.True wind must be from dead astern

C.True wind velocity must be faster than the ship's speed

D.True wind must be from dead ahead

Which of the following statements is TRUE regarding automatic identification systems（AIS）________．

A.AIS cannot be used to make passing arrangements because the system is not capable of this type of ship-to-ship communications

B.AIS cannot be used to make passing arrangements because the ship-to-ship text messaging feature is for emergency use only

C.AIS can be used to make passing arrangements via ship-to-ship text messaging but a vessel operator is not relieved from the requirement to sound whistle signals or make arrangements via bridge-to-bridge radiotelephone

D.AIS can be used to make passing arrangements via ship-to-ship text massaging thus relieving a vessel operator from making such arrangements via bridge-to-bridge radiotelephone or signaling intent to pass via whistle signals

All the following is true except that ______．

A.in many places a counter current flows in opposition to the main current close to the bank

B.current can vary with depth of water and large deep draught ships can experience different current effects at differing parts of the hull tend to turn to the wind

C.as speed is reduced，the increased proportion of the ship's vector which is attributable to current will set the ship close to obstructions

D.when close to the berth in a head current，there is a danger that flow inshore of the ship becomes restricted and the ship is subject to interactive forces

Diesel engines are considered safer than gasoline engines because ______．

A.They are more heavily built

B.The fuel used is less volatile

C.They can be easily reversed

D.They operate at a lower speed

Large quantities of uncovered big iron or billets should not be carried in the upper-tween decks because ______.

A.this does not eliminate the risk of cargo shifting

B.this will increase the metacentric height of the ship

C.this will decrease the gravity height of the ship

D.this will reduce the rolling period of the ship