Specific Knowledge:

• Ships Types
  
  There are many types of ships that transport cargoes at sea. According to their use, the cargo ships can be divided into dry cargo ships and tankers. Following are about dry cargo ship.
  Dry Cargo Ship
  According to the loaded cargo, structure and components, dry cargo ships can be divided into such as follows:
  
  1. General Cargo Ship
  General cargo ships are referred to the ships that run termly in the busy cargo-transporting shipping lines and mainly transport grocery. The speed of these ships is fast. There are several deck floors in the ship framework to divide the cabin into a few cargo tanks, so that various cargoes can be loaded in the ship.
  
  2. Bulk Cargo Ship
  Bulk cargo ships are referred to the ships that transport bulk cargoes without packaging. According to the types of transported cargoes, bulk cargo ships can be divided into grain ships, colliers and ore ships. Most of these ships have single deck. And there are not supports in the cabin. However, clapboards are usually set up to keep cargo in the cabin from being put in the wrong place while the ship is running in stormy waves.
  
  3. Refrigerated Ship
  Refrigerated ships are referred to the special ships for transporting refrigerant cargoes that are perishable. There are refrigeration systems in the ships, and the temperature in the ship can be set to meet the requirement of cargoes in each floor.
  
  4. Timber ship
  Timber ships are referred to the ships for transporting timber or log. The cabin mouth of the ship is large. There are no girder poles and other devices in the cabin that would disturb loading and unloading cargoes. The timber can be loaded on the cabin and deck. Usually, the bulwarks, which are no less than 1 meter, are set up on the both sides of the shipboard to keep the timer on the board from flushing out to the outside of shipboard.
  
  5. Container Ship
  Container ships can be divided into partial container ships, complete container ships and variable container ships.
  　1)Partial container ship
  　2)Full Container Ship
  　3)Convertible Container Ship
  
  6.Roll on/Roll off Ship
  Rolling loading ships are mainly for transporting cars and containers. Loading devices are not necessary for these ships. Usually, uncorked slope is installed on the side or in either end of the ships to join the ship to the dock. While loading and unloading cargoes, cars or trail cars can directly drive into or out of the ship cabins. The advantage of these ships is that loading devices of docks are not required and loading speed will be fast so that the ships can be used more efficiently.
  
  7. Barge Carrier
  Barge carriers are also called mother-and-son ships. They are referred to the ships carrying barge that have been loaded with cargoes. The advantage of these ships is that they are not restricted with the water depth of docks and no docks are needed to anchor the ships. It is efficient for loading and unloading cargoes that can be performed without anchoring. At present, barge carriers are mainly of two types: lighter aboard ships, abbreviation for LASH, and Seabee ships.
  
  
• Tanker
  1.Oil Tanker
  2.Liquefied Natural Gas Carrier
  
  
• Registered Tonnage
  Ships dimension tonnage is the unit of calculating ship dimension. It is also called as registered tonnage. It is the unit that used in ship registration in marine countries, which takes ton as the computing unit. One registered ton is equal to 100 cubic feet or 2.83 cubic meters. Ships dimension tonnage can also be divided into two classes: gross registered tonnage and net registered tonnage.
  
  1． Gross Registered Tonnage (GRT)
  It is also called as gross dimension tonnage. It refers to the total inner space or volume of all closed sites in the cabins and on the board. And it is the quotient that takes 100 cubic feet or 2.83 cubic meters as one ton. Gross registered tonnage is widely used in many fields. It can be used for the country to estimate the argosies. Also, it can used to denote the ship size. It can be used for ship registration. And it can be used for government to determine the ship or ship-making allowance. It can be used to compute insurance cost, ship-making cost, ship compensation and so on.
  
  2. Net Registered Tonnage (NRT)
  It is also called as net dimension tonnage. It refers to the margin that the amount of room, which is not for business, is subtracted from gross registered tonnage. And it is the equivalent cargo tonnage that the ship can be loaded. Net registered tonnage is usually used for ship applying to customs and ending customs. And it is the basis of ships paying for various taxes and cost to ports. Also, it can be used as the basis of paying canal cost when ships pass through canals.