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单选题
The controlling depth of the river is（）.
A
the minimum depth of the river prescribed in the channel maintenance program
B
the edge of a dredged channel
C
the highest level to which the river may rise without flooding
D
the least available water in a channel which limits the draft of boats and tows
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For the deepest water when rounding a bend in a river, you should navigate your vessel____.A.toward the inside of the bendB.toward the outside of the bendC.toward the center of the river just before the bend, then change course for the river’s venter after the bendD.in the river’s center
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单选题River currents tend to（）.A
Pick up speed where the channel widensB
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单选题When anchoring,it is a common rule of thumb to use a length of chain（）.A
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单选题In moderate wind and current what should be the length of chain with a single anchor?（）A
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depth of water at a specific time due to tidal effectB
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单选题In bad weather，what length of chain should be used with a single anchor? （）A
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考题
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考题
单选题When anchoring a vessel under normal conditions，which scope of chain is recommended? （）A
Four times the depth of waterB
Two and one-half times the depth of waterC
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