Under-keel height
Under-keel clearance
Under-keel draft
Under-keel depth
第1题：
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
第2题：
甲板部由大副负责。（）
第3题：
船舶在浅水域航行时，需要一定的富余水深，富余水深是指：
A.海图水深-船舶吃水
B.实际水深-海图水深
C.海图水深+潮高-船舶静止时最大吃水
D.海图水深+潮高-船舶静止时平均吃水
第4题：
下列贸易术语条件下，卸货费用由卖方负担的是（）
第5题：
某轮吃水7米，在某锚地锚泊，若该处最大波高为3米，则他应选择的锚地应能保证在低潮时具有（）。
第6题：
A ship under construction or major repair will acquire permanent magnetism due to ______ while sitting stationary in the earth's magnetic field．
A.hammering and jarring
B.vibration and pounding
C.varying magnetic fields
D.stable or permanent magnetism of the ship
第7题：
富余水深是用来保证船舶航行安全的
第8题：
The depth of the ship below the waterline measured vertically to the lowest part of the hull is called
A.trim
B.lean
C.draft
D.tonnage
第9题：
（）(富余水深) is the depth remaining under a ship’s bottom.
第10题：
Pay out all of the cable before setting up on the brake to insure the anchors dig in and hold
For a mud，mud and clay，or sandy bottom pay out a scope of 5 to 7 times the depth before setting up on the brake
Use one or both anchors with a scope of twice the depth before setting the brake
Drop the anchor to short stay and hold that scope