单选题When preparing a ship for heavy weather，fuel oil day tanks should be（）.Apumped overboard to calm the seasBdrained to the lower hull to reduce free surfacesCfilled to ensure that sufficient fuel oil is available during a lengthy emergencyDpartially drained to increase free surfaces in order to reduce motions
单选题
When preparing a ship for heavy weather，fuel oil day tanks should be（）.
A
pumped overboard to calm the seas
B
drained to the lower hull to reduce free surfaces
C
filled to ensure that sufficient fuel oil is available during a lengthy emergency
D
partially drained to increase free surfaces in order to reduce motions
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