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单选题
（）refers to the depth of a vessel below the waterline，measured vertically to the lowest part of the hull，propellers or other reference points.
A
Free board
B
Stability height
C
Metacentric height
D
Draft
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单选题（）refers to the height from the waterline to the bottom of the ship.A
DraftB
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also called GMB
the void portion of the ship below the waterline which is enclosed and watertightC
affected by the number of transverse watertight bulkheadsD
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单选题（）is an opening for supplying seawater to condensers, pumps,etclocated in the hull below the waterline and having means for the attachment of associated piping.A
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side of the vessel exposed to the windB
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The line below the tropical load waterlineD
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reserve buoyancyD
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考题
单选题All echo-sounders can measure the（）.A
actual depth of waterB
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The tank lie above the waterline and are filledB
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The tanks are partially filled with liquid cargoD
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Four times the depth of waterB
Two and one-half times the depth of waterC
Five to seven times the depth of waterD
Fifteen times the depth of water
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单选题What is the normal length of anchor cable used to anchor a vessel?（）A
An amount equal to the depth of the waterB
Two times the depth of waterC
Three to four times the depth of waterD
Five to seven times the depth of water
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