单项选择题
A Doppler speed log indicates speed through the water（）.
A.at all times
B.in the bottom return mode
C.in the volume reverberation mode
D.only when there is no current
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A disadvantage of using chain lashing on heavy vehicles aboard Ro-Ro vessels is that it is （）.
A.heavy
B.easily damaged
C.affected by temperature
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A decrease in barometric pressure is associated with all of the following except（）.
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