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All the following is true except that（）.
A:in many places a counter current flows in opposition to the main current close to the bank
B:current can vary with depth of water and large deep draught ships can experience different current effects at differing parts of the hull tend to turn to the wind
C:as speed is reduced，the increased proportion of the ship's vector which is attributable to current will set the ship close to obstructions
D:when close to the berth in a head current，there is a danger that flow inshore of the ship becomes restricted and the ship is subject to interactive forces

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出自：海船船员证

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