问题
单项选择题
A current moving across a lock entrance toward the river or toward the dam is called a(n)（）.
A.cutoff
B.outdraft
C.lockwash
D.springpool
答案
参考答案：B
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A current moving across a lock entrance toward the river or toward the dam is called a(n)（）.
A.cutoff
B.outdraft
C.lockwash
D.springpool
参考答案：B