______is the number of millimeters by which the mean draft changes when a ship passes from salt water to fresh water，or vice versa，whilst floating at the loaded draft．
A.TPC
B.The Fresh Water Allowance
C.Parallel sinking of the ship
D.UKC
第1题：
A.A
B.B
C.C
D.D
第2题：
When are fore and aft draft readings required to be entered in the unofficial logbook of a ship?
A.Once a day
B.Once a week
C.Prior to getting underway
D.Only when entering waters of different density
第3题：
An internet is a combination of networks connected by (71) .When a datagram goes from a source to a (72) ，it will probably pass many (73) until it reaches the router attached to the destination network．A router receives a (74) from a network and passes it to another network．A router is usually attached to several networks．When it receives a packet，to which network should it pass the packet? The decision is based on optimization： Which of the available (75) is the optimum pathway?
A．modems
B．routers
C．switches
D．computers
第4题：
Which statement is true about a distributed call control environment and the processing of dialed digits from an IP phone？（）
第5题：
You are on a 50.3 meters long vessel with a draft of 2.7 meters and twin screws．Which statement about rescuing a survivor in the water with ship pickup is TRUE ________．
A.You should stop to windward of the man and drift down on him
B.You should stop with the man on your weather beam and twist the ship up to him
C.A pickup off the weather bow gives maximum maneuverability with the least possibility of injury to the man
D.Ship pick up should never be used with a shallow draft vessel
第6题：
Steam smoke will occur when ______.
A.extremely cold air from shore passes over warmer water
B.warm dry air from shore passes over cooler water
C.cold ocean water evaporates into warm air
D.cool rain passes through a warm air mass
第7题：
The number and position of hydrants arranged on board shall be such that _______，one of which shall be from a single length of hose，may reach any part of the ship normally accessible to the passengers or crew while the ship is being navigated．
A.at least two jets of water which shall be from the same length of hose
B.at least two jets of water emanating from the same hydrant
C.at least two jets of water not emanating from the same hydrant
D.at least two jets of water not emanating from the same hydrant，one of which shall be from a single length of hose
第8题：
A. It allows users to retain all uncommitted changes when exiting exclusive configuration mode.
B. It allows multiple users to edit private copies of the configuration concurrently.
C. It causes the loss of all uncommitted changes when exiting exclusive configuration mode.
D. It excludes other users from editing the configuration.
第9题：
For a floating vessel, true mean draft is always the ______.
A.average of the observed drafts
B.draft at the center of flotation
C.draft corresponding to the calculated displacement
D.mean of the calculated drafts
第10题：
The （）from waterline to the bottom of the ship is called draft.