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单选题
A backlash below a lock is defined as a（）.
A
current setting your vessel on the wall
B
current setting into the lock chamber
C
an eddy working along the lower guide wall
D
current setting counterclockwise
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单选题The lockmaster has given you permission to tie off on the lower guide wall to wait your turn to lock through. What should you be most concerned with? （）A
A downbound vesselB
An upbound vesselC
Current reaction when the lock chamber is being emptiedD
Current reaction when the lock chamber is being filled
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