单选题During the dock repair, should be measured firstly before tail shaft drawn out（）Athe sinking of tail shaftBthe clearance of stern bearingCthe total flexure of shaftDmain engine crankshaft deflection
单选题
During the dock repair, should be measured firstly before tail shaft drawn out（）
A
the sinking of tail shaft
B
the clearance of stern bearing
C
the total flexure of shaft
D
main engine crankshaft deflection
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