The controlling depth of the river is（）.<br>A:the minimum depth of the river prescribed in the channel maintenance program<br>B:the edge of a dredged channel<br>C:the highest level to which the river may rise without flooding<br>D:the least available water in a channel which limits the draft of boats and tows

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

出自：海船船员证

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