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What could cause a significant difference between actual chain tension and the tension measured by the tensiometer? （）
A:The type of anchor and mooring line being used
B:The type of bottom in which the ship is anchored
C:A significant difference between air and water temperature
D:The chain contacting a chock or fairlead between the tensiometer and the lower swivel fairlead

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出自：海船船员证

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